Samson 42-34 Mounting And Operating Instructions
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Samson 42-34 Mounting And Operating Instructions

Samson 42-34 Mounting And Operating Instructions

Self-operated regulators, differential pressure regulators with flow limitation
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Self-operated Regulators
Differential Pressure Regulators with
Flow Limitation
Type 42-34 · Type 42-38
Type 42-34
Mounting and
Operating Instructions
EB 3013 EN
Edition July 2009
Type 42-38

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Summary of Contents for Samson 42-34

  • Page 1 Self-operated Regulators Differential Pressure Regulators with Flow Limitation Type 42-34 · Type 42-38 Type 42-38 Type 42-34 Mounting and Operating Instructions EB 3013 EN Edition July 2009...

  • Page 2: Table Of Contents

    Contents Contents Page Design and principle of operation ..... . 4 Installation ....... . . 6 Mounting position .
  • Page 3 Safety instructions General safety instructions The regulators must be installed, started up and serviced by fully trained and qualified personnel only, observing the accepted industry codes and practi- ces. Make sure employees or third persons are not exposed to any danger. The regulator complies with the requirements of the European Pressure Equip- ment Directive 97/23/EC.

  • Page 4: Design And Principle Of Operation

    (Type The regulators in sizes DN 15 to 100 are 42-38) or adjustable (Type 42-34). The re- equipped with a connecting piece (10) for the striction built into the valve body allows for low-pressure control line between the valve limitation of the flow rate.
  • Page 5 Design and principle of operation Type 42-34, Type 42-38 · Balanced by a bellows Type 42-34 DN 15 to 250 Type 2423 Valve Type 42-38 balanced by a bellows DN 15 to 100 Type 2428 Actuator Type 2424 Actuator Low-pressure control line (up to DN 100) 9.1 Low-pressure control line...

  • Page 6: Installation

    Installation Type 42-34 · Balanced by a diaphragm · DN 125 to 250 Type 2423 Valve balanced by a diaphragm Type 2424 Actuator Valve body Seat 1.1 Restriction (for flow rate Plug set point adjustment) Plug stem 1.2 Lock nut 5.1 Balancing diaphragm...

  • Page 7: Mounting Position

    Installation Note: Install a strainer (e.g. SAMSON NOTICE Type 2 N/2 NI) upstream of the regulator to Protect the regulator when it is used to control prevent sealing particles, welding spatter or freezing process media. other impurities carried along by the process...

  • Page 8: Control Line, Equalizing Tank And Needle Valve

    Control line kit · A control line kit for tapping pressure directly at the valve body is avail- able as an accessory from SAMSON. Refer to Data Sheet T 3095 EN. Equalizing tank · An equalizing tank is re- quired for liquids above 150 °C.

  • Page 9: Operation

    Check Needle valve (optional) the installed strainer (e.g. by measuring the Motorized valve pressure drop) afterwards. Clean the strainer, if necessary. Fig. 5 · Typical installation, Type 42-34/42-38 installed in the return flow pipe EB 3013 EN...

  • Page 10: Set Point Adjustment

    (see Table 2 · Flow rate set points for water). Type 42-34 only · Set the required differen- tial pressure by turning the set point screw Note: Always start the set point adjustment (17) when the plant is almost closed and the based on a closed restriction.
  • Page 11 Fig. 7. The vertical line above point D which meets A Type 42-34 Regulator, DN 25, set point point E shows the required number of turns of range 0.25 to 3.5 m³/h, is to be used in a the set point screw.

  • Page 12: 3.2.3 Pressure Conditions In The Plant And Regulator

    Fig. 6 shows a schematic diagram of the plant’s pressure conditions. Δp Δp Δp set point restriction Δp plant Type 42-34 Type 42-38 Δp Δp Minimum differential pressure between Differential pressure (pressure drop) across plant flow and return flow pipes in bar a completely open plant in bar &...

  • Page 13: Decommissioning

    Operation Table 2 · Flow rate set points for water in m³ Type 2423 Valve balanced by a bellows Δp Δp Δp DN ... 100 125 150 200 250 set p. plant restr. 0.05 0.15 0.25 0.4 7.7 11.2 126 154 120 180 220 120 180 260 300 Max.
  • Page 14 Operation Differential pressure set point (fixed for Type 42-38, adjustable Type 42-34) Δp (bar) Pressure drop across the plant Turns of the set point adjuster ˚ DN 15 DN 20 DN 25 Upper diff. pressure Δp Fig. 7 · Adjustment diagram DN 15 to 25...
  • Page 15 Operation Differential pressure set point (fixed for Type 42-38, adjustable Type 42-34) Δp (bar) Pressure drop across the plant Turns of the set point adjuster ˚ 12.0 DN 32 15.0 18.0 DN 40 21.0 24.0 27.0 DN 50 Upper diff. pressure Δp Fig.
  • Page 16 Operation Differential pressure set point (fixed for Type 42-38, adjustable Type 42-34) Δp (bar) Pressure drop across the plant Turns of the set point adjuster ˚ 10 9 DN 65 DN 80 DN 100 Upper diff. pressure Δp Fig. 9 · Adjustment diagram DN 65, DN 80 and DN 100...
  • Page 17 Operation Differential pressure set point (fixed for Type 42-38, adjustable Type 42-34) Δp (bar) Pressure drop across the plant Turns of the set point adjuster ˚ DN 125 DN 150 Upper diff. pressure Δp Fig. 10 · Adjustment diagram DN 125 and DN 150...

  • Page 18: Maintenance · Troubleshooting

    Maintenance · Troubleshooting Maintenance · CAUTION! Troubleshooting On performing any work on the regulator, make sure the relevant section of the pipeline The regulators are maintenance free. Never- is depressurized and, depending on the pro- theless, they are subject to natural wear, par- cess medium, drained as well.

  • Page 19: Replacing The Operating Diaphragm

    NOTICE Do not completely close needle valve. Contact SAMSON if the malfunction cannot be remedied using the above table. section of the pipeline of pressure and drain Replacing the operating it.
  • Page 20 Secure nut (18) from new diaphragm. turning with suitable adhesive (e.g. 9. Insert diaphragm stem. Tighten nuts (18) 8121-0230 from SAMSON). Use lubri- to fix diaphragm, diaphragm plate and cant from SAMSON (8150-0111). washer into place. Secure nut (18) from 8.

  • Page 21: Nameplates

    Nameplates Nameplates Valve nameplates Valve Valve type Model number Model number index Order number or order date coefficient Nominal size Nominal pressure 10 Perm. differential pressure in bar DIN version 11 Perm. temperature in °C 12 Body material ANSI version Nominal size Perm.

  • Page 22: Dimensions And Weights

    Fig. 12 · Dimensions, valve balanced by a bellows – see Table 5 on p. 23 – Valve balanced by a diaphragm Table 4 · Dimensions in mm and weights Type 42-34 · Valve balanced by a diaphragm Nom. size DN Length L Height H1...
  • Page 23 − − − − − − − Forged steel Type 42-34 Differential Pressure Regulator with Flow Limitation · Balanced by a bellows Height H 990 1120 1260 Set point range Ø D = 285 mm Ø D = 390 mm Ø...

  • Page 24: Customer Service

    Addresses of SAMSON subsidiaries, agencies and service centers are listed in the prod- uct catalogs and in the Internet at www.samson.de. To allow SAMSON to find the fault and to have an idea of the installation situation, specify the following details (refer to the nameplate):...
  • Page 25 Technical data Valve balanced by a diaphragm Type 42-34 Nominal size DN 125 to 250 Nominal pressure PN 16, 25 or 40 (acc. to DIN EN 12516-1) Valve body See pressure-temperature diagram in T 3013 EN Max. perm. With equalizing tank: Liquids up to 220 °C...
  • Page 26 SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main · Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 EB 3013 EN Internet: http://www.samson.de...

This manual is also suitable for:

42-38

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