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PERSTA DSK 10 Operating Instructions Manual

High pressure gate valves
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Operating instructions
High Pressure Gate Valves
DSK and DSP
Read the instructions prior to performing any task!

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  • Page 1 Operating instructions High Pressure Gate Valves DSK and DSP Read the instructions prior to performing any task!
  • Page 2 Mülheimer Str. 18 59581 Warstein-Belecke, Germany Telephone: +49 2902 762-02 Fax: +49 2902 767-03 Email: info@persta.de Internet: www.persta.com Translation of the original operating instructions Dok.-Nr. 6401.DE.STD.06.2017, 4, en_GB © Stahl-Armaturen PERSTA GmbH 2017 High Pressure Gate Valves DSK and DSP 20.05.2021...
  • Page 3 This manual applies to the following versions of the series 700 JT and 700 CT of the high pressure gate valves DSK and DSP: Designation Series Nominal Pressure rate Class diameter (DN) [mm] DSK 10 700 JT 50–150 PD 10 DSK 10 700 JT 200–350/300 PD 10 £725...
  • Page 4 Supplemental directives Customer Service - Stahl-Arma- Mülheimer Str. 18 turen PERSTA GmbH 59581 Warstein, Germany Phone: +49 2902 762-02 Fax: +49 2902 767-03 e-mail: info@persta.de Revision overview Revision number Change/Supplemented informa- Date tion “ Intended Updates to chapter 05/05/2021 use”.

  • Page 5: Table Of Contents

    Table of contents Table of contents Overview................7 Safety................... 9 2.1 Symbols in this manual..........9 2.2 Intended use............... 11 2.3 Safety signs..............12 2.4 Safety devices............14 2.5 Residual risks............. 17 2.5.1 Basic dangers at the workplace....... 17 2.5.2 Electric shock hazard..........18 2.5.3 Danger due to hydraulics.........
  • Page 6 Table of contents 5.7 For a pneumatic actuator, connecting the pneumatic system................ 48 5.8 After the installation............ 48 5.8.1 Pickling the valve............. 49 5.8.2 Painting the valve............ 49 5.8.3 Executing a system pressure test and leak test..50 5.8.4 Applying thermal insulation........50 Initial start-up..............

  • Page 7: Overview

    Overview Overview Overview – high pressure gate valves Fig. 1: High pressure gate valve (shown here: DSK 10 series) Actuator (in the example: handwheel) Nozzle for over pressure safety device (optional) Stem Body Bonnet Shut-off element (in the example: flexible discs)
  • Page 8 Overview Shut-off element The models DSK and DSP differ in the type of shut-off element: DSK: flexible disc gate valve DSP: parallel discs Ä Chapter 3.3.1 “Shut-off element” on page 31. Actuator variants The stem is moved differently depending on the version: manually via handwheel electrically hydraulically...

  • Page 9: Safety

    Safety Symbols in this manual Safety 2.1 Symbols in this manual Safety instructions Safety instructions are indicated by symbols in this manual. The safety instructions are introduced by signal words that indicate the scope of the hazard. DANGER! This combination of symbol and signal word indi- cates a hazardous situation that, if not avoided, will result in death or serious injury.
  • Page 10 Safety Symbols in this manual Example: Loosen the bolt. CAUTION! Risk of getting trapped by the cover! Close the cover carefully. Tighten the bolt. Special safety instructions The following symbols are used in the safety instructions to indi- cate special hazards: Warning signs Type of danger Warning –...

  • Page 11: Intended Use

    Safety Intended use 2.2 Intended use Ä “Scope of the document” Valves of the specified series ( on page 3) are designed for installation in pipes under the fol- lowing conditions: Operation of the valve as an open/close valve. Operation of the valve with liquid or gaseous media, without particular corrosive, chemical or abrasive impact.

  • Page 12: Safety Signs

    Safety Safety signs Misuse WARNING! Danger in the event of misuse! Misuse of the valve can cause dangerous situa- tions. – Never use the valve in potentially explosive areas without complying with the instructions and measures contained in the ignition hazard assessment GA004.
  • Page 13 Safety Safety signs WARNING! Danger if signs are illegible! Over time, stickers and signs can become fouled or can become illegible in some other manner, so that dangers are not recognised and necessary operating instructions cannot be complied with. This results in a danger of injury. –...

  • Page 14: Safety Devices

    Safety Safety devices 2.4 Safety devices Fig. 2: Division into “chambers” In the closed position, there are 3 “chambers” in the valve: 1st chamber: pressurized side (Fig. 2/1) 2nd chamber: non-pressurized side (Fig. 2/2) 3rd chamber: shut-off inner chamber (Fig. 2/3) Have the operating company safeguarded the 3rd chamber against overloading.
  • Page 15 Safety Safety devices Optional connection for external safety devices Depending on the application, the valve (Fig. 3/1) can be equipped with an external over pressure safety device by the operating com- pany. In this regard, the valve can delivered with a sealed nozzle from the manufacturer (Fig.
  • Page 16 Safety Safety devices Equalizing pipe An equalizing pipe (Fig. 5/1) is used to create a connection between the 3rd chamber (Fig. 2/3) and the pressurised side (Fig. 2/1 of the valve. WARNING! Risk of injury from alternating flow direction! There is a risk of serious injury if the specified flow direction is not complied with when an equalizing pipe is used to protect the valve.

  • Page 17: Residual Risks

    Safety Residual risks > Basic dangers at the workplace Bore in the seat ring An optional bore in the seat ring prevents pressure in the body from exceeding the operating pressure of the valve. WARNING! Risk of injury from alternating flow direction! There is a risk of serious injury if the specified flow direction is not complied with when a bore in the seat ring is used to protect the valve.

  • Page 18: Electric Shock Hazard

    Safety Residual risks > Danger due to hydraulics Trip hazard CAUTION! Danger of injury due to tripping up! There is a danger of fall injuries in the area of use of the valve. – Install cable and connection lines in such a manner that there are no trip hazards.

  • Page 19: Hazards Associated With The Pneumatic System

    Safety Residual risks > Mechanical hazards 2.5.4 Hazards associated with the pneumatic system Hazards associated with the pneu- matic system WARNING! Danger of injury due to pneumatic energy! Pneumatically-powered components of the valve, can cause severe injuries. – Only have pneumatic specialists perform tasks on the pneumatic equipment.

  • Page 20: Thermal Dangers

    Safety Residual risks > Dangers due to hazardous substances and operating materials 2.5.6 Thermal dangers Thermal dangers WARNING! Danger of injury due to high/low temperatures! Depending on the insert of the valve or of the pipe, injuries can occur due to the high or low tempera- ture of the components.
  • Page 21 Safety Residual risks > Dangers due to hazardous substances and operating materials WARNING! Pumping medium is a health hazard! Contact with the pumping medium can have health implications. – Handle pumping medium in accordance with the instructions in the manufacturer’s safety data sheet.

  • Page 22: Behaviour In The Event Of An Emergency

    Safety Personnel requirements 2.6 Behaviour in the event of an emergency Shut off the pipe sections affected. Comply with the in-house regulations. Ä Chapter 7.3 “Oper- Operating the valve in an emergency ( ating the valve in an emergency” on page 63). 2.7 Personnel requirements WARNING! Danger of injury due to inadequate personnel...
  • Page 23 Safety Personnel requirements They have been instructed by the operator on how to handle the plant and receive regular training. The industrial mechanic is capable of maintaining and repairing installations and valves in the high pressure area independently. Pipeline engineer Based on their specialised training, skills, experience and knowl- edge of the applicable standards and provisions, the pipeline engi- neer is able to carry out the work assigned to them and to inde-...

  • Page 24: Responsibility Of The Operating Company

    Safety Responsibility of the operating company Unauthorised persons WARNING! Risk of fatal injury for unauthorised persons due to hazards in the danger zone and work area! Unauthorised persons who do not satisfy the requirements described here are not aware of the hazards in the work area.

  • Page 25: Personal Protective Equipment

    Safety Personal protective equipment The operating company must obtain information about the appli- cable occupational health and safety regulations and, in a hazard assessment, identify the additional hazards that may exist at the installation site of the valve due to the specific working conditions.
  • Page 26 Safety Personal protective equipment During the various tasks performed on and with the machine, per- sonnel must wear personal protective equipment, to which special reference is made in the individual sections of this manual. Description of the personal protec- The personal protective equipment is described below: tive equipment Chemical resistant safety gloves Chemical resistant safety gloves are intended to protect hands...

  • Page 27: Spare Parts

    Ä Chapter 7.3 “Operating the valve in Please see an emergency” on page 63 for information on storing spare parts. Ordering spare parts Order spare parts from Stahl-Armaturen PERSTA GmbH, with specification of valve type, Year of manufacture, Nominal diameter,...

  • Page 28: Environmental Protection

    Safety Environmental protection 2.11 Environmental protection ENVIRONMENT! Hazards for the environment due to improper handling of environmentally-harmful sub- stances! If environmentally-harmful substances are handled incorrectly, particularly if they are disposed of incorrectly, significant environmental damage can occur. – Always comply with the instructions cited below for handling and disposal of environmentally- harmful substances.

  • Page 29: Functional Description

    Depending on the type, optional display elements can be attached Ä Chapter 3.3.3 “Display ele- to the high pressure gate valve ( ments” on page 36). Fig. 7: Section view (shown: Series DSK 10) 20.05.2021 High Pressure Gate Valves DSK and DSP...

  • Page 30: Seal To The Outside

    Functional description Seal to the outside 3.2 Seal to the outside Gland packing The gland packing seals the stem against the environment. The gland follower flange (Fig. 8/1) is pressed onto the sealing ele- ments using stud bolts (Fig. 8/2): Gland follower Chamber ring Packing ring...

  • Page 31: Versions Of The High Pressure Gate Valve

    Functional description Versions of the high pressure gate valve > Shut-off element Pressure sealing bonnet The body is sealed against the environment via the pressure sealing bonnet. An axial force is generated through the internal pressure in the body. This axial force acts on the elastic gasket ring (Fig. 9/5) via the cover (Fig.
  • Page 32 Versions of the high pressure gate valve > Shut-off element Flexible disc system (DSK) Fig. 10: Flexible disc system (shown: DSK 10 50–150) For the DSK version flexible discs are used as shut-off elements. Two wedge-shaped discs (Fig. 10/1) are fastened to the lower end of the stem, and are guided into the body in grooves or strips.

  • Page 33: Actuator Variants

    Functional description Versions of the high pressure gate valve > Actuator variants Parallel disc system (DSP) Fig. 11: Parallel disc system (shown: Series DSP 26) For the DSP version parallel discs are used as shut-off elements. Two parallel discs (Fig. 11/1) are attached to the lower end of the stem.
  • Page 34 Functional description Versions of the high pressure gate valve > Actuator variants Manual actuator (handwheel) Fig. 12: Manual actuator The stem is driven manually with the handwheel. The handwheel can be attached in the following manner: Direct attachment Bevel gearbox with handwheel Spur gear unit with handwheel Remote actuator High Pressure Gate Valves DSK and DSP...
  • Page 35 Functional description Versions of the high pressure gate valve > Actuator variants Electric actuator With the optional electric actuator the stem is driven via an electric motor. The electric motor is connected to the valve above the bonnet. The electric actuator is adjusted by the manufacturer in the close and open direction via limit switches.

  • Page 36: Display Elements

    DSK / DSP 10 DN 350–700 DSK / DSP 16–63 (all DN) the mechanical position indicator is standard equipment. For series DSK 10 DN 50–300 DSP 10 DN 50–300 the mechanical position indicator is optionally available. 3.3.4 Connections Connection in the pipe...
  • Page 37 Functional description Versions of the high pressure gate valve > Connections Information on connection is provided in the oper- ating manual for the electric actuator. Hydraulic connections Connections for the customer-provided hydraulic supply are pro- vided on the flanges or on the control valves on the hydraulic piston actuator.
  • Page 38 Functional description Versions of the high pressure gate valve > Connections High Pressure Gate Valves DSK and DSP 20.05.2021...

  • Page 39: Transport And Storage

    Transport and storage Safety instructions for transport and storage Transport and storage 4.1 Safety instructions for transport and storage Heavy weight of the valve WARNING! Risk of injury due to the heavy weight of the valve! The heavy weight of the valve and its components can cause severe injuries.

  • Page 40: Transport Of Packages

    Transport and storage Transport of packages 4.2 Transport of packages Depending on the size, valves are delivered individually or on a pallet. Transporting individual valves Personnel: Trained person (hoist) Protective equipment: Industrial hard hat Protective gloves Safety footwear Special tool: Sling gear Hoist DANGER!

  • Page 41: Storage Of The Valve

    Transport and storage Storage of spare parts 4.3 Storage of the valve Storage of the valve Store valves under the following conditions: Store valve in closed status (delivery status). Do not store outdoors. Store in a dry and dust-free location. Do not expose to any aggressive media.
  • Page 42 Transport and storage Storage of spare parts Metal spare parts NOTICE! Material damage through reduced service life due to incorrect storage! Incorrect storage of metal spare parts can reduce the service life. – Regularly treat metal spare parts with anti-corro- sive oil.

  • Page 43: Installation

    Installation Safety instructions for installation Installation 5.1 Safety instructions for installation Electric shock DANGER! Risk of fatal injury from electric shock! There is a risk of fatal injury when touching live components of the actuator. Switched-on electrical components can execute uncontrolled movements and can cause serious injuries.
  • Page 44 Installation Safety instructions for installation Faulty installation WARNING! Risk of injury due to incorrectly installed valve! A faulty installation can cause injuries or result in the malfunction of the gate valve. – Pay attention to the flow direction of valves. –...

  • Page 45: Before The Installation

    – For maintenance work or if the threaded con- nections have come loose, you can find the tightening torques – by contacting the Stahl-Armaturen PERSTA GmbH customer service (see p. 4 for contact details) and providing the serial number or –...

  • Page 46: Installing The Valve

    Installation Attaching additional safety devices 5.3 Installing the valve Personnel: Pipeline engineer Trained person (hoist) Protective equipment: Protective work clothing Protective gloves Industrial hard hat Safety footwear Special tool: Sling gear Hoist Prepare the respective pipe section for the installation. Use a hoist to bring the valve into the installation position.

  • Page 47: For Electric Actuators, Connect The Power Supply

    Installation For a hydraulic actuator, connecting the hydraulic system 5.5 For electric actuators, connect the power supply Personnel: Qualified electrician Protective equipment: Protective work clothing Safety footwear Prerequisite: Ensure that the customer-provided power supply is switched off and safeguarded against being switched on again. Terminal diagram and operating manual are located on the actuator.

  • Page 48: For A Pneumatic Actuator, Connecting The Pneumatic System

    Installation After the installation 5.7 For a pneumatic actuator, connecting the pneumatic system Personnel: Pneumatics Specialist Protective equipment: Safety goggles Protective work clothing Safety footwear Switch off the customer-provided pneumatic supply and safe- guard it from being switched on again. Connect the pneumatic actuator of the valve to the customer- provided pneumatic supply in accordance with the provided connection plan.

  • Page 49: Pickling The Valve

    Installation After the installation > Painting the valve WARNING! Anticorrosive is a health hazard! Direct contact with the anticorrosive used can have health implications. – Handle anticorrosive in accordance with the instructions in the manufacturer’s safety data sheet. – Wear protective equipment: Protective gloves, safety footwear, protective goggles, protective work clothing.

  • Page 50: Executing A System Pressure Test And Leak Test

    Installation After the installation > Applying thermal insulation 5.8.3 Executing a system pressure test and leak test Changing the flow direction WARNING! Risk of injury by changing the flow direction! When protecting the valve with: – an equalizing pipe, – a bore in the disc or –...
  • Page 51 Installation After the installation > Applying thermal insulation Personnel: Pipeline engineer Protective equipment: Safety goggles Protective work clothing Protective gloves Safety footwear If necessary, have the thermal insulation fitted by the oper- ating company. Ensure that all operating elements, as well as stuffing box areas and over pressure safety devices remain permanently accessible and controllable.
  • Page 52 Installation After the installation > Applying thermal insulation High Pressure Gate Valves DSK and DSP 20.05.2021...

  • Page 53: Initial Start-Up

    Initial start-up Safety instructions for commissioning Initial start-up 6.1 Safety instructions for commissioning Danger of freezing WARNING! Danger of injury due to pipes shattering at freezing temperatures! As a result of pipes shattering at freezing tempera- tures, severe injuries can be caused by fluid under high pressure.
  • Page 54 Initial start-up Safety instructions for commissioning Pumping medium WARNING! Danger of injury due to pumping medium under pressure! In operating status, as well as in decommissioned status, depending on the version of the valve, inju- ries can occur due to medium escaping under high pressure.
  • Page 55 Initial start-up Safety instructions for commissioning Danger of injury due to misuse WARNING! Danger of injury due to force-increasing objects! By using force-increasing objects (rods/tubes) as levers for actuating the handwheel, injuries can occur due to damage of components in the force flux.

  • Page 56: Prior To Commissioning

    Initial start-up Prior to commissioning 6.2 Prior to commissioning Personnel: Pipeline engineer Protective equipment: Industrial hard hat Safety goggles Protective work clothing Protective gloves Safety footwear Prerequisites: The overall system must be released for operation. Valve with manual actuator Fully open the valve by turning the handwheel counterclock- wise (Fig.

  • Page 57: Executing The Commissioning Process

    Initial start-up Executing the commissioning process 6.3 Executing the commissioning process Personnel: Pipeline engineer Industrial mechanic (high pressure valves) Protective equip- Industrial hard hat ment: Safety goggles Protective work clothing Protective gloves Safety footwear Prerequisites: The overall system must be released for operation. WARNING! Failure to comply with the heating-up times/cooling times!
  • Page 58 Initial start-up Executing the commissioning process High Pressure Gate Valves DSK and DSP 20.05.2021...

  • Page 59: Operation

    Operation Safety instructions for operation Operation 7.1 Safety instructions for operation Thermal dangers WARNING! Danger of injury due to high/low temperatures! Depending on the insert of the valve or of the pipe, injuries can occur due to the high or low tempera- ture of the components.
  • Page 60 Operation Safety instructions for operation Failure to comply with the heating- up times/cooling times WARNING! Danger of injury due to failure to comply with the heating-up times/cooling times! Insufficient heating-up times/cooling times may lead to impermissible deformation of the valve and reduce the service life.

  • Page 61: Operating The Valve

    Turn clockwise (Fig. 18/2): Close valve. Turn counterclockwise (Fig. 18/1): Open valve. Fig. 18: Activating handwheel (shown: Series DSK 10 with optional nozzle) 7.2.2 Valve with electric actuator The valve is operated by the higher-level control system or the local control system.

  • Page 62: Valve With Hydraulic Or Pneumatic Actuator

    Operation Operating the valve > Valve with hydraulic or pneumatic actuator 7.2.3 Valve with hydraulic or pneumatic actuator The valve is operated by the higher-level control system or the local control system. See the scope of delivery of the valve for additional information.

  • Page 63: Operating The Valve In An Emergency

    Operate the handwheel. Turning clockwise (Fig. 19/2): closes the valve. Turning anticlockwise (Fig. 19/1): opens the valve. Fig. 19: Manual actuator: Activating the handwheel in an emergency (shown here: DSK 10 with optional nozzle) 20.05.2021 High Pressure Gate Valves DSK and DSP...

  • Page 64: Valve With Electric Actuator

    Operation Operating the valve in an emergency > Valve with electric actuator 7.3.2 Valve with electric actuator Coupling/uncoupling the handwheel See the operating manual of the actuator for infor- mation on coupling and uncoupling the handwheel for operating the valve in an emergency. Personnel: Industrial mechanic (high pressure valves)

  • Page 65: Valve With Hydraulic Or Pneumatic Actuator

    Operation Operating the valve in an emergency > Valve with hydraulic or pneumatic actuator 7.3.3 Valve with hydraulic or pneumatic actuator See the operating manual of the actuator for infor- mation on operating the valve in an emergency. 20.05.2021 High Pressure Gate Valves DSK and DSP...
  • Page 66 Operation Operating the valve in an emergency > Valve with hydraulic or pneumatic actuator High Pressure Gate Valves DSK and DSP 20.05.2021...

  • Page 67: Maintenance

    Maintenance Safety instructions for maintenance Maintenance 8.1 Safety instructions for maintenance Safeguard against restart DANGER! Life-threatening danger due to unintended restart! The unauthorised switch-on of the energy supply during work poses a danger of severe or fatal inju- ries for persons in the danger zone. –...
  • Page 68 Maintenance Safety instructions for maintenance Pressurised components WARNING! Danger of injury due to pressurised compo- nents! Tasks on pressurised components can result in serious injuries. – Establish depressurised status before working on the valve. Heavy weight of the valve WARNING! Danger of injury due to the heavy weight of the valve! The heavy weight of the valve, and of its compo-...
  • Page 69 – Only use genuine spare parts from Stahl-Arma- turen PERSTA GmbH or spare parts approved by Stahl-Armaturen PERSTA GmbH. – If in doubt, always contact Stahl-Armaturen PERSTA GmbH customer service (contact details on p.
  • Page 70 Maintenance Safety instructions for maintenance Pumping medium WARNING! Danger of injury due to pumping medium under pressure! In operating status, as well as in decommissioned status, depending on the version of the valve, inju- ries can occur due to medium escaping under high pressure.

  • Page 71: Maintenance Schedule

    If regular inspections indicate increased wear, the required mainte- nance intervals must be reduced in accordance with the actual signs of wear. For questions concerning maintenance tasks and intervals, contact Stahl-Armaturen PERSTA GmbH customer service (see p. 4 for contact details). Interval Maintenance work Personnel Ä...

  • Page 72: Maintenance Tasks

    Maintenance Maintenance tasks > Replacing the gland packing 8.3 Maintenance tasks 8.3.1 Visually checking the valve Personnel: Trained person (operator) Protective equipment: Industrial hard hat Safety goggles Protective work clothing Protective gloves Safety footwear Check the stuffing box for leaks. Check the cover for leaks.
  • Page 73 Maintenance Maintenance tasks > Replacing the gland packing An existing actuator must have been dismounted. The valve must have been driven into the middle position in order to empty the 3rd chamber and to offload the shut-off ele- ment (discs). Detaching the anti-twist device If the anti-twist device is present: Detach the fastening (Fig.
  • Page 74 Maintenance Maintenance tasks > Replacing the gland packing WARNING! Danger of injury due to escaping medium! Lift off the gland follower flange (Fig. 23/1) upwards. Use the packing extractor to remove the gland packing. For gland packing elements with metal caps (chamber ring): Fully dismount the cover ( Ä...
  • Page 75 Maintenance Maintenance tasks > Replacing the gland packing Execute concluding tasks Attach the gland follower flange (Fig. 24/1) and bolt on uni- formly with nuts (Fig. 24/2) as specified by the manufacturer. Fig. 24: Mounting the gland follower flange 20.05.2021 High Pressure Gate Valves DSK and DSP...
  • Page 76 Maintenance Maintenance tasks > Replacing the gland packing Mount the bonnet (Fig. 25/1). WARNING! Danger of injury due to the wrong tight- ening torque! Attach the fastening screws (Fig. 25/3) of the bonnet and tighten in a cross pattern as specified by the manufacturer. Fig.

  • Page 77: Replacing The Gasket Of The Pressure Sealing Bonnet

    Maintenance Maintenance tasks > Replacing the gasket of the pressure sealing bonnet 8.3.3 Replacing the gasket of the pressure sealing bonnet Personnel: Industrial mechanic (high pressure valves) Trained person (hoist) Protective equip- Industrial hard hat ment: Safety goggles Protective work clothing Protective gloves Safety footwear Special tool:...
  • Page 78 Maintenance Maintenance tasks > Replacing the gasket of the pressure sealing bonnet Using the pin puncher, punch the segments (Fig. 28/2) into the interior and through the outer ejection bores (Fig. 28/1). Remove the segments (Fig. 28/2). Place the bonnet with threaded bush on the stem (turn). Place 2 segments between the body and the bonnet.
  • Page 79 Maintenance Maintenance tasks > Replacing the gasket of the pressure sealing bonnet Lift the support ring upwards (Fig. 30/3) off of the cover (Fig. 30/1). Lift the gasket ring upwards (Fig. 30/2) off of the cover (Fig. 30/1). Carefully remove the residues of the gasket ring. NOTICE! Material damage due to the mechanical processing of support surfaces!
  • Page 80 Maintenance Maintenance tasks > Replacing the gasket of the pressure sealing bonnet Insert segments (Fig. 32/1) into the body groove (Fig. 32/2). Fig. 32: Inserting segments If present, place the clamping lid (Fig. 33/2) on from above. WARNING! Danger of injury due to the wrong tight- ening torque! Screw the clamping lid (Fig.

  • Page 81: Lubricating Moving Parts (Stem Thread)

    Maintenance Maintenance tasks > Lubricating moving parts (stem thread) Executing final tests after replace- ment Personnel: Industrial mechanic (high pressure valves) Trained person (hoist) Protective equip- Industrial hard hat ment: Safety goggles Protective work clothing Protective gloves Safety footwear Prerequisite: Replacement of the seal is concluded.

  • Page 82: After Maintenance

    Maintenance After maintenance Comply with the instructions in the manufac- turer’s documentation for the hydraulic/pneu- matic actuator. For a hydraulic/pneumatic actuator: Operate the valve via the controller. Open the valve completely. Depending on the version: Grease the stem thread with a brush Grease stem thread and bearing via lubricating nipple Completely close valve.

  • Page 83: Faults And Troubleshooting

    Faults and troubleshooting Safety notices for fault correction Faults and troubleshooting 9.1 Safety notices for fault correction Electric shock DANGER! Risk of fatal injury from electric shock! There is a risk of fatal injury when touching live components of the actuator. Switched-on electrical components can execute uncontrolled movements and can cause serious injuries.
  • Page 84 – the valve is depressurised – the valve has cooled-down/warmed-up to ambient temperature. – If in doubt, consult experienced persons or Stahl-Armaturen PERSTA GmbH customer service (contact details on p. 4). – Comply with the following before restarting the system: –...
  • Page 85 Faults and troubleshooting Safety notices for fault correction Pumping medium WARNING! Danger of injury due to pumping medium under pressure! In operating status, as well as in decommissioned status, depending on the version of the valve, inju- ries can occur due to medium escaping under high pressure.

  • Page 86: Fault Table

    If correction of the fault requires work in the danger zone, secure the system area in question, and depressurise the valve. In case of faults that prevent the safe operation of the valve: Consult Stahl-Armaturen PERSTA GmbH customer service (contact details on p. 4). 9.2 Fault table Fault description Cause...
  • Page 87 End contacts are defec- Have the end contacts checked. Qualified electri- valve tive cian Prior to readjustment, consult Stahl- Armaturen PERSTA GmbH customer service (see p. 4 for contact details). Torque switch is defec- Have the torque switch checked. Qualified electri- tive cian...
  • Page 88 Faults and troubleshooting Fault table Fault description Cause Remedy Personnel Jerky lifting move- Gland packing is too Readjust gland packing, replace if Industrial mechanic Ä Chapter 8.3.2 “Replacing ment tight necessary ( (high pressure the gland packing” on page 72). valves) High Pressure Gate Valves DSK and DSP 20.05.2021...

  • Page 89: Dismantling, Disposal

    – Secure the components so that they do not fall down or fall over. – If anything is unclear obtain the assistance of Stahl-Armaturen contact PERSTA GmbH cus- tomer service (contact details p. 3). 20.05.2021 High Pressure Gate Valves DSK and DSP...
  • Page 90 Dismantling, disposal Safety notice for dismantling and disposal Heavy weight of the valve WARNING! Danger of injury due to the heavy weight of the valve! The heavy weight of the valve, and of its compo- nents, can result in severe injuries. –...
  • Page 91 Dismantling, disposal Safety notice for dismantling and disposal Fluid under high pressure WARNING! Danger of injury due to hydraulic energy! Hydraulically-powered components of the valve, as well as the triggering of the overpressure valve can cause severe injuries. – Only have specialised personnel perform tasks on the hydraulic system.

  • Page 92: Dismantling

    Dismantling, disposal Dismantling WARNING! Pumping medium is a health hazard! Contact with the pumping medium can have health implications. – Handle pumping medium in accordance with the instructions in the manufacturer’s safety data sheet. – Wear protective equipment: Protective gloves, safety footwear, protective goggles, protective work clothing.

  • Page 93: Disposal

    Dismantling, disposal Disposal For electric actuator: – Power supply is switched off and physically disconnected. For a hydraulic or pneumatic actuator: – Ensure that the customer-provided hydraulic/pneumatic supply is switched off and safeguarded against being switched on again. – Hydraulic lines/pneumatic lines are in depressurised status. –...
  • Page 94 Dismantling, disposal Disposal High Pressure Gate Valves DSK and DSP 20.05.2021...

  • Page 95: Index

    Index Index Dismantling ......92 Disposal ......93 Abrasion .
  • Page 96 Index Instruction ......24 Pipeline medium ......8 Intended use .
  • Page 97 Index On the valve ......13 System pressure test ....50 Valve insulation .

This manual is also suitable for:

Dsk 26Dsk 10-63Dsp 10-63

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