Azbil VDD Series User Manual
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Azbil VDD Series User Manual

Azbil VDD Series User Manual

Weir diaphragm control valves
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OM2-8110-0530
Weir Diaphragm Control Valve
Model VDD_ _ _
User's Manual

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Summary of Contents for Azbil VDD Series

  • Page 1 OM2-8110-0530 Weir Diaphragm Control Valve Model VDD_ _ _ User’s Manual...
  • Page 2 In no event is Azbil Corporation liable to anyone for any indirect, special or consequential damages, The information and specifications in this...
  • Page 3 Conventions Used in This Manual „ The safety precautions explained below aim to prevent injury to you and others, and to prevent property damage. Warnings are indicated when mishandling this product may WARNING result in death or serious injury. Cautions are indicated when mishandling this product may CAUTION result in minor injury or property damage only.
  • Page 4 Precautions for Safe Operation WARNING Before starting to work, check that the pressure in the pipes has dropped to atmospheric pressure. If fluid spews out, injury may result. CAUTION Do not stand on the device or use it as a step. There is a risk of falling. Do not touch the device unnecessarily while it is operating.
  • Page 5 Handling Precautions „ Installation Precautions WARNING If the rated pressure or standards for connection are ignored when this device is used, damage to the product or leakage may cause a serious accident. When connecting the valve to the piping, do not put your hand or foot under the valve or between flanges.
  • Page 6 CAUTION Use bolts and nuts that conform to the standards for the pipe flange. Otherwise fluid leakage could result. Use new flange gaskets that are appropriate for the properties of the fluid, the operating temperature, and the pressure. Damaged gaskets may cause fluid leakage. Open the valve fully before flushing the inside of the piping, and do not change the valve travel while the pipes are being flushed.
  • Page 7 Tighten evenly in a diagonal pattern. Max. weight...
  • Page 8 Precautions for Air Supply Piping and Electrical Work CAUTION For air supply, use pipes with an appropriate internal diameter so that pressure will not drop while the valve is operating. Failure to do so may result in poor valve performance. Wiring work should be carried out only by qualified technicians following local electrotechnical standards.
  • Page 9 Precautions for Assembly and Disassembly WARNING Before starting work, clean the inside of the valve, replace any residual gas, etc. Otherwise, the residual fluid may cause an injury. Do not disassemble the pneumatic actuator while supply air pressure is being applied. The compressed air may cause an injury.
  • Page 10 Close Open Close valve Close valve pressure pressure Valve Pressure regulator Follow the assembly procedure Replace the packing and gasket Tighten bolts to speci ed torque Packing Gasket viii...
  • Page 11 Precautions for Maintenance WARNING If fluid leakage from the valve is found, stay away from the valve until safety can be confirmed. Depending on the properties of the fluid, a serious accident or injury may result. CAUTION Check the gland daily, and tighten the packing if leakage is found. Check valve operation daily, including a visual check for hunting.
  • Page 12 The location of the product’s nameplate is shown in the figure below. Inquiries For inquiries about this device, contact the azbil Group. When making an inquiry, have your model number and product number ready.
  • Page 13 Precautions for Storage Observe the following precautions in order to store the purchased valve properly. • If the valve is packed in a cardboard box, store it indoors at room temperature and humidity. • A valve packed in a wooden crate should also generally be stored indoors at room temperature and humidity.

  • Page 14: Table Of Contents

    Contents Chapter 1: Overview ..................1 1.1 Scope ......................1 1.2 Composition....................1 1.3 Structure ......................1 1.4 Nameplate ..................... 2 Chapter 2: Installation ................... 3 2.1 Maximum Weight for Hoisting with Eyebolts ..........3 2.2 Installation on the Piping ................3 2.3 Inspection after Installation and Precautions for Operation ......

  • Page 15: Chapter 1: Overview

    Azbil Corporation Chapter 1: Overview 1.1 Scope This manual contains handling instructions for the weir diaphragm control valve. 1.2 Composition The weir diaphragm control valve is composed the valve body section and the actuator. The combinations of valve size, pressure rating, connection method, and material vary depending on the purpose of use.

  • Page 16: Nameplate

    Azbil Corporation 1.4 Nameplate A nameplate (Figure 1-2) is attached to the control valve. The nameplate indicates the model number, valve size, pressure rating, material, date of manufacture, and other major specifications of the control valve. Check that the specifications indicated on the nameplate are appropriate for the application.

  • Page 17: Chapter 2: Installation

    Azbil Corporation Chapter 2: Installation ~CAUTION The inner surfaces of certain models of control valves are lined with glass, hard rubber, or other material which is not highly resistant to mechanical shock. Exercise care when handling these models. 2.1 Maximum Weight for Hoisting with Eyebolts In principle, use the eyebolts* attached to the diaphragm case for mounting or removing the actuator only.

  • Page 18: Inspection After Installation And Precautions For Operation

    Azbil Corporation CAUTION If a pressure regulator with air filter is mounted on this device, install this device on the piping so that the drain of the regulator faces downward. If the regulator cannot be vertical (if its drain does not face downward), remove it from this device.

  • Page 19: Chapter 3: Maintenance And Inspection

    Azbil Corporation Chapter 3: Maintenance and Inspection (1) As a part of regular maintenance, inspect the control valve routinely for the following. (a) Hunting in response to the valve travel signal (b) Abnormal sound or vibration (c) Leaks of fluid from the air vent hole of the bonnet...
  • Page 20 Azbil Corporation Table 3-3 Tightening torque of bolts and nuts that connect body with bonnet Unit: N·m Connection diameter Diaphragm material: PTFE Diaphragm material: rubber (inches) (body material: anything other (natural rubber, chloroprene, than hard natural rubber) EPDM) 1-1/2 17.0 30.0...

  • Page 21: Chapter 4: Disassembly And Assembly

    Azbil Corporation Chapter 4: Disassembly and Assembly This chapter describes disassembly and assembly procedures for overhaul inspection and for parts replacement due to modification of specifications, etc. ~CAUTION (1) Before disassembling a control valve that is installed on the piping, be sure to shut off the fluid in the piping, release the process pressure completely from the valve, and wait until the valve cools off.
  • Page 22 Azbil Corporation Table 4-4 Connection methods and diaphragm shapes Valve nominal Diaphragm material Connection method Shape diameter (inches) 1/2 ‒ 3/4 Fit-in type Rubber Normally open 1 ‒ 4 Screw-in type Backing of Rubber PTFE 1/2 ‒ 4 PTFE Normally closed...
  • Page 23 Azbil Corporation Slots Compressor Compressor Diaphragm Bayonet pin Bayonet type Fit-in type Diaphragm Figure 4-1 Types Of Couplings Between Diaphragm and Compressor (2) Attach the spindle to the diaphragm unit of the valve body section. (3) Apply grease to the surface of the spindle, O-rings, and threads of the bolts and nuts.

  • Page 24: Disassembly And Reassembly Of The Actuator

    Azbil Corporation Table 4-5 Pressure resistance test (water pressure) Unit: MPa Connection diameter Diaphragm material: PTFE Diaphragm material: rubber (inches) (body material: anything other (natural rubber, chloroprene, than hard natural rubber) EPDM) 1-1/2 2-1/2 ~CAUTION (1) Make sure that grease is not applied to the diaphragm.

  • Page 25: Mounting The Actuator On The Valve Body

    Azbil Corporation 4.4 Mounting the Actuator on the Valve Body (1) Place the actuator on the valve body and tighten the yoke nuts firmly. (2) Connect air piping to the actuator to provide a pneumatic control signal. A pressure regulator may be used for the pneumatic control signal source.

  • Page 26: Adjustment Of Positioner

    Azbil Corporation 4.5 Adjustment of Positioner For details on positioners, refer to the user’s manuals below. • Pneumatic single-acting valve positioner (model HTP): document No. OM2-8310-0200 • Pneumatic single-acting valve positioner (model VPE): document No. OM2-8310-0410 • Smart valve positioners...

  • Page 27: Chapter 5: Main Parts To Be Replaced

    Azbil Corporation Chapter 5: Main Parts to be Replaced Parts of this control valve can be used for a long period of time, but the following parts should be replaced at every periodic inspection.  Valve body section O-rings: Every five years...
  • Page 28 Azbil Corporation...

  • Page 29: Chapter 6: Disposal

    Azbil Corporation Chapter 6: Disposal If this device is no longer needed, dispose of it appropriately as industrial waste, in accordance with local regulations. Do not reuse all or a part of the device.
  • Page 32 Warranty period and warranty scope 1.1 Warranty period Azbil Corporation’s products shall be warranted for one (1) year from the date of your purchase of the said products or the delivery of the said products to a place designated by you.
  • Page 33 Although acceleration of the above situation varies depending on the conditions or environment of use of the products, you are required not to use any Azbil Corporation’s products for a period exceeding ten (10) years unless otherwise stated in specifications or instruction manuals.
  • Page 35 Document Number : OM2-8110-0530 Document Name : Weir-Type Diaphragm Control Valve Model VDD User’s Manual Date : 1st edition: Nov. 1988 4th edition: Feb. 2022 Issued / Edited by : Azbil Corporation...

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