Spirax Sarco SRV2S Manuale utente

IM-P186-03 CH Issue 4 1

SRV2S

Pressure Reducing Valve

Installation and Maintenance Instructions

IM-P186-03

CH Issue 4

1860050/4

1. Safety information

2. General

product information

3. Installation

4. Maintenance

5. Spare parts

6. Fault ﬁnding

IM-P186-03 CH Issue 4

IM-P186-03 CH Issue 4 3

1. Safety information

1.1 Intended use

Referring to the Installation and Maintenance Instructions, name-plate and Technical

Information Sheet, check that the product is suitable for the intended use / application.

The product complies with the requirements of the European Pressure Equipment

Directive 97/23/EC and falls within category 'SEP'. It should be noted that products

within this category are required by the Directive not to carry the mark.

i) The product has been speciﬁcally designed for use on steam, compressed air

and inert industrial gases which are in Group 2 of the above mentioned Pressure

Equipment Directive. The products’ use on other fluids may be possible but, if

this is contemplated, Spirax Sarco should be contacted to conﬁrm the suitability

of the product for the application being considered.

ii) Check material suitability, pressure and temperature and their maximum and

minimum values. If the maximum operating limits of the product are lower than

those of the system in which it is being fitted, or if malfunction of the product

could result in a dangerous overpressure or overtemperature occurrence, ensure

a safety device is included in the system to prevent such over-limit situations.

iii) Determine the correct installation situation and direction of ﬂuid ﬂow.

iv) Spirax Sarco products are not intended to withstand external stresses that may

be induced by any system to which they are fitted. It is the responsibility of the

installer to consider these stresses and take adequate precautions to minimise

them.

v) Remove protection covers from all connections and protective film from all

name-plates, where appropriate, before installation on steam or other high

temperature applications.

Safe operation of this product can only be guaranteed if it is properly installed,

commissioned, used and maintained by qualiﬁed personnel (see Section 1.11)

in compliance with the operating instructions. General installation and safety

instructions for pipeline and plant construction, as well as the proper use of tools

and safety equipment must also be complied with.

Warning

The bellows assembly gasket contains a thin stainless steel support ring which may

cause physical injury if not handled and disposed of carefully.

IM-P186-03 CH Issue 4

1.2 Access

Ensure safe access and if necessary a safe working platform (suitably guarded)

before attempting to work on the product. Arrange suitable lifting gear if required.

1.3 Lighting

Ensure adequate lighting, particularly where detailed or intricate work is required.

1.4 Hazardous liquids or gases in the pipeline

Consider what is in the pipeline or what may have been in the pipeline at some

previous time. Consider: flammable materials, substances hazardous to health,

extremes of temperature.

1.5 Hazardous environment around the product

Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases,

extremes of temperature, hot surfaces, fire hazard (e.g. during welding), excessive

noise, moving machinery.

1.6 The system

Consider the effect on the complete system of the work proposed. Will any proposed

action (e.g. closing isolation valves, electrical isolation) put any other part of the

system or any personnel at risk?

Dangers might include isolation of vents or protective devices or the rendering

ineffective of controls or alarms. Ensure isolation valves are turned on and off in a

gradual way to avoid system shocks.

1.7 Pressure systems

Ensure that any pressure is isolated and safely vented to atmospheric pressure.

Consider double isolation (double block and bleed) and the locking or labelling of

closed valves. Do not assume that the system has depressurised even when the

pressure gauge indicates zero.

1.8 Temperature

Allow time for temperature to normalise after isolation to avoid danger of burns.

1.9 Tools and consumables

Before starting work ensure that you have suitable tools and / or consumables

available. Use only genuine Spirax Sarco replacement parts.

1.10 Protective clothing

Consider whether you and/or others in the vicinity require any protective clothing

to protect against the hazards of, for example, chemicals, high / low temperature,

radiation, noise, falling objects, and dangers to eyes and face.

IM-P186-03 CH Issue 4 5

1.11 Permits to work

All work must be carried out or be supervised by a suitably competent person.

Installation and operating personnel should be trained in the correct use of the

product according to the Installation and Maintenance Instructions.

Where a formal 'permit to work' system is in force it must be complied with. Where

there is no such system, it is recommended that a responsible person should know

what work is going on and, where necessary, arrange to have an assistant whose

primary responsibility is safety.

Post 'warning notices' if necessary.

1.12 Handling

Manual handling of large and /or heavy products may present a risk of injury. Lifting,

pushing, pulling, carrying or supporting a load by bodily force can cause injury

particularly to the back. You are advised to assess the risks taking into account the

task, the individual, the load and the working environment and use the appropriate

handling method depending on the circumstances of the work being done.

1.13 Residual hazards

In normal use the external surface of the product may be very hot. If used at the

maximum permitted operating conditions the surface temperature of some products

may reach temperatures of 210°C (410°F).

Many products are not self-draining. Take due care when dismantling or removing

the product from an installation (refer to 'Maintenance instructions').

1.14 Freezing

Provision must be made to protect products which are not self-draining against

frost damage in environments where they may be exposed to temperatures below

freezing point.

1.15 Disposal

Unless otherwise stated in the Installation and Maintenance Instructions, this

product is recyclable and no ecological hazard is anticipated with its disposal

providing due care is taken.

1.16 Returning products

Customers and stockists are reminded that under EC Health, Safety and

Environment Law, when returning products to Spirax Sarco they must provide

information on any hazards and the precautions to be taken due to contamination

residues or mechanical damage which may present a health, safety or

environmental risk. This information must be provided in writing including

Health and Safety data sheets relating to any substances identiﬁed as hazardous

or potentially hazardous.

IM-P186-03 CH Issue 4

2. General product information

Fig. 1 SRV2S screwed body

Spring range ID disc

2.1 Description

The SRV2S is a compact, stainless steel, direct acting pressure reducing valve designed

for applications using steam or gases such as compressed air. All wetted parts are

constructed in 316L stainless steel.

SRV2S pressure reducing valves are supplied with one of three colour coded springs which

are identiﬁed by the disc (18) located on the adjustment handwheel (2):

Grey For downstream pressure control: 0.14 to 1.7 bar g (2.03 to 24.65 psi g)

Green For downstream pressure control: 1.40 to 4.0 bar g (20.30 to 58.00 psi g)

Orange For downstream pressure control: 3.50 to 8.6 bar g (50.75 to 124.70 psi g)

Note: Where control spring ranges overlap always use the lower range to give better control.

Standards

This product fully complies with the requirements of the European Pressure Equipment

Directive 97 / 23 / EC.

Certiﬁcation

This product is available with certiﬁcation to EN 10204 3.1. Note: All certiﬁcation / inspection

requirements must be stated at the time of order placement.

Note: For further product data see Technical Information Sheet, TI-P186-05.

2.2 Sizes and pipe connections

½", ¾" and 1" screwed BSP ( BS 21 Rp ) or NPT.

DN15, DN20 and DN25 Flanged EN 1092 PN25 and ANSI 150.

(18)

Adjustment handwheel Tamper-proof pin

(2)

IM-P186-03 CH Issue 4 7

The product must not be used in this region.

Body design conditions PN25

Maximum design pressure 25 bar g @ 120°C (362 psi g @ 248°F)

Maximum design temperature 212°C @ 19 bar g (413°F @ 275 psi g)

Minimum design temperature 0°C (32°F)

Maximum operating pressure for saturated steam service 19 bar g (275 psi g)

Maximum operating temperature 212°C @ 19 bar g (413°F @ 275 psi g)

Minimum operating temperature 0°C (32°F)

Note: For lower operating temperatures consult Spirax Sarco

Maximum downstream reduced pressure 8.6 bar g (125 psi g)

Maximum differential pressure 19 bar (275 psi)

Maximum recommended turndown ratio 10:1 at maximum ﬂow

Designed for a maximum cold hydraulic test pressure of: 38 bar g (551 psi g)

Note: With internals ﬁtted, test pressure must not exceed: 19 bar g (275 psi g)

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Temperature °C

Pressure bar g

Steam

saturation

curve

2.3 Pressure /temperature limits

Pressure psi g

Temperature °F

IM-P186-03 CH Issue 4

3. Installation

A Steam trap

B Strainer

C Isolating valve

D Safety valve

E Pressure gauge

F Separator

3.1 General installation

Always install the SRV2S with the flow direction arrow (on the body) pointing downstream.

The SRV2S pressure reducing valve is available as follows:

Screwed ½", ¾" and 1" BSP (BS 21 Rp) or

Flanged DN15, DN20 and DN25 EN 1092 PN25 and ANSI 150.

The Spirax Sarco SRV2S pressure reducing valve should always be fitted in a horizontal

pipeline. The adjustment head may be above or below the valve.

Isolating valves should be installed, upstream and downstream of the SRV2S, with a clear run

of 8 to 10 pipe diameters on either side.

It is important that line stresses, caused by expansion or inadequate pipe support, are not

imposed on the valve body.

Upstream and downstream piping must be of ample size to avoid undue pressure drop.

Any reduction in line size should be made using eccentric reducers.

Fitting a strainer on the upstream side will give additional protection to the valve. Install the

strainer on its side to prevent the body filling with water, which will reduce the effective

screening area. If the steam supply is wet a separator/trap set should be installed upstream.

Alternatively, an adequate drain pocket and a trap from the Spirax Sarco range should

be fitted.

A pressure gauge is essential on the downstream pipework to allow setting of the operating

pressure. It is an advantage to have a gauge on the upstream side of the valve, as well.

Safety valve

A safety valve should be fitted to protect the downstream equipment from excessive pressure

(to meet local standards). It should be set to lift below the safe working pressure of the

downstream equipment, and will normally be sized to pass the full capacity of the SRV2S should

it fail in the fully open position. The safety valve set pressure should take account of its reseat

characteristic and the 'No-load' pressure setting of the SRV2S. Discharge pipework should

be taken to a safe place.

Note: Before actioning any installation observe the 'Safety information' in Section 1.

Note: If you experience difﬁculty with installation or operation of this equipment please contact:

Spirax-Sarco Limited, Charlton House, Cheltenham, Gloucestershire, GL53 8ER

Tel: +44 (0)1242 521361, Fax: +44 (0)1242 573342

Fig. 2 Recommended installation

C1 C2

SRV2S

IM-P186-03 CH Issue 4 9

3.2 Start-up and adjustment for the SRV2S

Before final installation, all pipework should be thoroughly 'blown through' to remove dirt,

surplus jointing material, etc.

Pressure adjustment is made by turning the adjustment handwheel clockwise to increase

pressure and anticlockwise to reduce pressure.

With the upstream stop valve fully open and the downstream stop valve closed, slowly

increase the downstream pressure by turning the adjustment handwheel clockwise until the

desired pressure (shown on the downstream pressure gauge) is achieved.

Slowly open the downstream stop valve.

Under normal flow condition, the reduced pressure setting will fall slightly, but will control

under 'dead end' co ons. If required the pressure setting can be increased by readjusting the

SRV2S control. There will be a slight increase in set pressure under 'No-load' conditions.

3.3 How to make the SRV2S tamper-proof:

- When the required set pressure has been achieved, lift out the coloured spring range ID

disc (grey, green or orange) from the adjustment handwheel recess. This is carried out by

inserting a small screwdriver blade under the edge of the ID disc.

- A small loose pin will be found in the recess in the adjustment handwheel.

- This tamper-proof pin is inserted into the locking hole 'A', and into one of a ring of 10 matching

holes in the top of the spring housing. The SRV2S is now tamper-proof.

- Replace the coloured spring range ID disc ﬁrmly into the recess of the adjustment

handwheel.

Fig. 3

Spring range ID disc

Tamper-proof pin

Adjustment handwheel

IM-P186-03 CH Issue 4

4. Maintenance

Note: Before actioning any maintenance programme observe

the 'Safety information' in Section 1.

Warning

The bellows assembly gasket contains a thin stainless steel support ring which may

cause physical injury if not handled and disposed of carefully.

4.1 General information

Refer to Fig 4 (page 7) for view of parts.

The valve and valve seat must be kept clean.

Any strainer fitted upstream of the SRV2S and strainer screen (15) fitted inside the SRV2S

should be cleaned regularly so that the flow to the valve is not restricted.

The internal strainer is part of the valve seat assembly. This may be withdrawn by removing

the spring housing (1) and bellows assembly and unscrewing the valve assembly, using a

32 mm A / F spanner.

4.2 How to ﬁt a new valve and seat or clean the strainer screen:

i. Release the adjustment spring pressure by turning the adjustment handwheel (2) fully

anticlockwise.

ii. Remove the spring housing by undoing the 4 spring housing bolts (7) using 13 mm A/ F spanner.

iii. Lift out the bellows assembly (5) and the gasket (6).

iv. Using a 32 mm A /F spanner, unscrew the valve seat (11) and remove the valve, the return

spring, the strainer screen, the pushrod and the guide bush.

v. Clean the strainer screen (15) or replace with a new valve and seat assembly. Note: the valve

and seat assembly incorporates the strainer screen.

vi. Reassemble in the reverse order, using new gaskets, ensuring that the components and

seating faces are clean.

vii. Tighten the valve seat (11) to the following torque 162 - 198 N m (119 - 146 lbf ft).

viii. Tighten the spring housing bolts (7) to the following torque 18 - 24 N m (13 - 18 lbf ft).

4.3 How to ﬁt the new bellows:

Follow Steps i to iii, Section 4.2, then proceed as follows:

ix. Replace the bellows gasket and assembly, adjustment spring and the spring housing, and

tighten the spring housing bolts (7) to the following torque 18 - 24 N m (13 - 18 lbf ft).

4.4 How to ﬁt a replacement pressure adjustment spring:

Follow Steps i and ii, Section 4.2, then proceed as follows:

x. Replace the spring (4) and bonnet assembly and tighten the spring housing bolts (7) to the

following torque 18 - 24 N m (13 - 18 lbf ft).

xi. Lift out the spring identiﬁcation disc (18) and press in a new disc (if spring range has been

changed).

4.5

xii. The lower body section can be cleaned internally by removing the bottom cap (16).

xiii. Replace the 'O' ring (13) and retighten the bottom cap (16) to the required torque.

Table 1 Recommended tightening torques

Item No. Part N m (lbf ft)

7 Hex. bolts 13 A / F M8 x 25 18 - 24 (13 - 18)

11 Valve seat 32 A / F 162 - 198 (119 - 146)

16 Bottom cap 32 A / F 115 - 125 (85 - 93)

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