Swagelok RHPS Series Bedienungsanleitung

RHPS Series

BD(H)F40

User Manual

Read the complete manual before installing and using the regulator.

Contents

Introduction ............................................................................................................................................ 3

Installation .............................................................................................................................................. 5

Operation ................................................................................................................................................ 8

Maintenance ............................................................................................................................................ 9

Testing .................................................................................................................................................. 10

Troubleshooting ................................................................................................................................... 11

WARNING

Before removing a regulator from the system for service, you must

▪depressurize system

▪purge the system to remove any residual system media left in the regulator.

Introduction

Representative drawing of the standard BD(H)F40

1 body 11 overtravel spring 21 o-ring 31 blindplug 1/4" bsp

2 dome 12 clamp ring 22 ring 32 bonded seal

3 bottomplate 13 guide ring 23 socket head cap screw 33 male connector

4 valve case 14 retaining ring 24 ring 34 tube 3/8”

5 valve case ring 15 ring 25 socket head cap screw 35 male connector

6 valve stem 16 socket head cap screw 26 tube 36 pilot regulator

7 valve assembly o-ring 17 valve insert 27 flange 37

8 bodyplate 18 diaphragm 28 ring 38

9 domeplate 19 o-ring 29 socket head cap screw 39

10 seat 20 o-ring 30 o-ring 40

Dome loading with differential pressure

A differential pressure dome loaded regulator has a set spring inside the dome.

The set spring is used to maintain a desired pressure difference between the dome pressure and the

outlet pressure.

Usually the dome pressure is a reference pressure taken elsewhere out of the system.

Installation

WARNING

When installing a Swagelok®self-venting regulator, position the vent connection or

line away from operating personnel. Operating personnel must protect themselves

from exposure to system fluids.

CAUTION

Do not use the regulator as a shutoff device.

CAUTION

When using the BDH20 or BDHF25 with an inlet pressure higher than 200 bar (2 902

psig), a safety valve must be installed in the outlet line, because the outlet pressure

may not exceed 200 bar (2 902 psig).

Connections to System

The preferred mounting position of the regulator is horizontal with the dome facing upwards.

If grounding is required, connect a ground wire under a dome bolt.

Filling the dome

The dome can be filled in different ways.

1. This can be done by taking the gas pressure from the system and feeding this through a

regulating valve into the dome. A spring loaded backpressure regulator controls the dome

pressure.

This is shown in sketch A.

2. In liquid systems the gas pressure for manual dome loading can be taken from a cylinder or

mains. A spring loaded pressure regulator controls the dome pressure. This is shown in sketch

The best results will be achieved by allowing a flow to continuously pass through the pilot regulator.

This flow can either be vented or, in gas systems, fed back through an orifice into the downstream

piping.

This is usually referred to as “dynamic regulation”.

CAUTION

It is not recommended to place a gauge on the dome to set or check the inlet

pressure. Because of forces in the regulator, the dome pressure will always be lower

than the inlet pressure. Place a gauge in the inlet line to set or check the inlet

pressure.

External feedback

CAUTION

When using the regulator with external feedback, option –EF, make sure that the outlet

pressure can be fed back to the external feedback connection before applying

pressure to the regulator. Failing to do so may lead to damage and non-functioning of

the regulator as the inlet pressure will be put straight through to the outlet.

The purpose of the external feedback on a pressure regulator is to get a more accurate regulation of

the outlet pressure. This can be achieved by sensing the outlet pressure downstream of the regulator

and feeding it back to the regulator. For this purpose Swagelok has provided a special connection,

marked on the regulator itself as "external feedback".

Connecting the external feedback

The external feedback must be installed as follows:

▪The external feedback is to be connected in a turbulence-free zone in the downstream piping,

at a maximum distance of 5x the outside diameter of the down stream piping.

▪The external feedback must be connected on top of the downstream piping.

CAUTION

Never connect the external feedback line downstream of a shut-off valve.

Principle sketch of external feedback:

Operation

Note: All directions are when viewed from above.

▪Inlet and set pressure settings are obtained by adjusting pressure in the dome.

▪Increase the pressure in the dome to increase the inlet pressure.

▪Decrease the pressure in the dome to decrease the inlet pressure.

▪Icing of the regulator at high flow rates or high pressure drops may occur if the gaseous media or

atmosphere contains moisture.

▪An auxiliary upstream filter is recommended for use in all but the cleanest of media.

▪If the shut-off valve at the outlet side is closed after changing the set pressure, the outlet pressure

will rise a little because of the closing force required for bubble-tight closing of the regulator.

▪This phenomenon is usually referred to as the “lock-up” and does not indicate a problem with

the regulator.

▪After flow, the inlet pressure will fall a little under the set pressure.

This is because of the closing force required for bubble-tight closing of the regulator.

▪This phenomenon is usually referred to as the “reseat pressure” and does not indicate a

problem with the regulator.

▪An increase in the flow will result in a rise of the set pressure.

A decrease in the flow will result in a fall of the set pressure.

This is because of the force required for opening the valve of the regulator.

▪This phenomenon is usually referred to as the “accumulation pressure” and does not

indicate a problem with the regulator.

▪An increase of the outlet pressure will result in a fall of the set pressure.

A decrease of the outlet pressure will result in a rise of the set pressure.

▪This phenomenon is usually referred to as the “dependency” and does not indicate a

problem with the regulator.

Maintenance

Required tools for maintenance

▪a vice to fasten the regulator

▪pincers to take out the o-rings

▪a torque wrench

▪a torque wrench hexagon head key 6, 10 and 14

▪media and temperature compatible lubricant for reassembling threaded parts

▪media and temperature compatible lubricant for o-rings

▪Snoop®liquid leak detector

Disassembly

▪Loosen the hexagon socket head screws and remove the dome, dome plate, diaphragm, body

plate and valve assembly.

▪Loosen the hexagon socket head screws and remove the bottom plate and seat.

▪Loosen the hexagon socket head screws in the body plate and dome plate to remove the

diaphragm and the valve.

Inspection of disassembled parts

▪Check all parts for abnormal wear. Replace parts in case of doubt.

Points of attention before assembly

▪All parts must be clean and undamaged before starting assembly.

▪SWAGELOK B.V. recommends replacing all o-rings and the diaphragm before assembly.

▪All threaded parts must be lightly lubricated before assembly to avoid galling of threads.

▪All o-rings need to be lightly lubricated to improve the lifetime of the o-ring and the performance of

the regulator.

Assembly

Follow the points for disassembly in reverse order to assemble the regulator.

Recommended torques

CAUTION

Only tighten the bolts or parts if the regulator is completely depressurized.

▪Hexagon socket head screws M8 25 N·m (221 in.·lb)

▪Hexagon socket head screws M12 50 N·m (442 in.·lb)

▪Hexagon socket head screws M16 90 N·m (796 in.·lb)

Testing

Check the regulator for leakage across the seat, with low- and high inlet pressure.

Check the regulator for leakage across the diaphragm, with low- and high outlet pressure.

A well performing BD(H)F40 is 100 % bubble tight.

If there is a leakage across the seat or the diaphragm, the damaged parts must be replaced.

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