Spirax Sarco SRV66HC Manual de usuario

IM-P186 -11 CTLS Issue 2 1

SRV66HC High Capacity Sanitary Pressure Reducing Valve

1. Safety information

2. General product information

3. Installation

4. Operation

5. Commissioning

6. Maintenance

7. Spare parts

Printed in GB

1866351/2

SRV66HC High Capacity

Sanitary Pressure Reducing Valve

Installation and Maintenance Instructions

IM-P186 -11

CTLS Issue 2

IM-P186 -11 CTLS Issue 2

SRV66HC High Capacity Sanitary Pressure Reducing Valve

Safe operation of the unit can only be guaranteed if it is properly installed, commissioned and

maintained by a qualified person (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.

1.1 Intended use

Referring to these 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 EU Pressure Equipment Directive / UK Pressure Equipment (Safety)

Regulations 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, water and inert industrial

gases. These fluids are in Group 2 of the above mentioned Pressure Equipment Directive. The

product’s 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 occurance, 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 protective covers from all connections and protective film from all name-plates, where

appropriate, before installation on steam or other high temperatureapplications.

1.2 Access

Ensure safe access and if necessary a safe working platform 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. Safety information

IM-P186 -11 CTLS Issue 2 3

SRV66HC High Capacity Sanitary Pressure Reducing Valve

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 the danger of burns and consider

whether protective clothing (including safety glasses) is required.

PTFE protective film

If the PTFE protective film used inside the unit has been subjected to a temperature approaching

260 °C or higher, it will give off toxic fumes, which if inhaled is likely to cause temporary discomfort.

It is essential for a no smoking rule to be enforced in all areas where PTFE is stored, handled or

processed as persons inhaling the fumes from burning tabacco contaminated with PTFE particles

can develop 'polymer fume fever'.

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 any protective clothing is required by yourself and/or others in the vicinity to

protect against the hazards of, for example, chemicals, high/low temperature, noise, falling objects,

and dangers to eyes and face.

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 these 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 Spirax-Sarco 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.

IM-P186 -11 CTLS Issue 2

SRV66HC High Capacity Sanitary Pressure Reducing Valve

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 180 °C.

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 if

they are inoperative in environments where they may be exposed to temperatures below freezing

point.

1.15 Safety information - Product specific

This product should not be dismantled without first releasing the compression on the control spring.

1.16 Disposal

This product is recyclable and no ecological hazard is anticipated with its disposal providing due

care is taken, EXCEPT:

PTFE protective film:

-Can only be disposed of by approved methods, not incineration.

-Keep PTFE waste in a separate container, do not mix it with other rubbish, and consign it to a

landfill site.

1.17 Returning products

Customers and stockists are reminded that under UK and 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.

IM-P186 -11 CTLS Issue 2 5

SRV66HC High Capacity Sanitary Pressure Reducing Valve

2. General product information

2.1 Description

The SRV66HC all stainless steel sanitary pressure reducing valve is a double seated, high capacity, spring

loaded proportional control valve which also benefits from having a quick release body clamp ring. It is

designed for sanitary applications in the food processing, brewing/beverage and pharmaceutical industries.

The angle design allows for complete draining with no dead pockets and is suitable for use in CIP and SIP

systems. The valve does not require an external pilot line.

Valve tightness

Valve tightness is in accordance with VDI/VDE guideline 2174 (leakage rate < 0.5% of Kvs value).

Standard surface finish

Internal wetted parts - standard surface finish of Ra < 3.2 µm.

Please note: other surface finishes are available on request - contact Spirax Sarco.

Note:

For additional product data see Technical Information sheet TI-P186-10.

2.2 Sizes and pipe connections

DN25, DN40, DN50, DN65, DN80 and DN100 ISO 2852 sanitary

clamp compatible.

Please note: For other end connections contact Spirax Sarco.

Fig. 1 SRV66HC

IM-P186 -11 CTLS Issue 2

SRV66HC High Capacity Sanitary Pressure Reducing Valve

Temperature °C

Pressure bar g

Steam saturation curve

2.3 Pressure/temperature limits

The product must not be used in this region.

The product should not be used in this region or beyond its operating range as damage to the

internals may occur.

A-B-C Maximum operating conditions for steam.

D-E-C Maximum operating conditions for liquids and gases.

Body design conditions

Inlet PN16

Outlet see 'Pressure setting range' below

Maximum design pressure 15.2 bar @ 50 °C

Maximum design temperature 300 °C @ 9 bar g

Minimum design temperature -10 °C

Maximum operating temperature

EPDM diaphragm 130 °C

FPM diaphragm 180 °C

Maximum operating pressure (inlet) 8 bar g

Minimum operating temperature -10 °C

Designed for a maximum cold hydraulic test pressure of: 24 bar g

2.4 Pressure setting range

Size DN40 - DN100 DN25 - DN100 DN25 - DN100

Inlet/outlet PN16 / PN2.5 PN16 / PN6 PN16 / PN10

Spring range 0.3 - 1.1 bar g 0.8 - 2.5 bar g 2.0 - 5.0 bar g

IM-P186 -11 CTLS Issue 2 7

SRV66HC High Capacity Sanitary Pressure Reducing Valve

3.1 General information

Before installing the valve thoroughly flush the pipeline. Ideally the valve should be installed in a pressure

reducing valve station, see Figure 2, at the very minimum there should be a strainer with a separator (not

shown) fitted upstream, these should be serviced at regular intervals. The SRV66HC should always be fitted

with the inlet horizontal and the spring housing directly above the valve. Most applications will require a safety

valve to be installed downstream in case of accidental overpressure. It should be noted that the valve should

not be used as a shut-off valve, a separate valve should therefore be used for isolation purposes if required.

If it is possible for equipment downstream of the valve to be shut off then a further trap set should be installed

to prevent downstream flooding.

The pressure reducing valve should not be insulated as this may lead to over heating and destroy the

elastomer seals.

1Strainer

2Stop valves

3Pressure reducing valve

4Safety valve

5Pressure gauge

6Leakage line G 1/8 (option)

Fig. 2 Recommended installation

Bypass for maintenance

Steam

flow

3. Installation

IM-P186 -11 CTLS Issue 2

SRV66HC High Capacity Sanitary Pressure Reducing Valve

4.1 How the SRV66HC works

The outlet pressure to be controlled is balanced across the diaphragm by the force of the valve spring

(set pressure). As the outlet pressure rises above the pressure set using the adjustment screw, the valve

cone moves towards the seat and the volume of medium is reduced. As the outlet pressure drops the valve

control orifice increases; when the pipeline is depressurised the valve is open. Rotating the adjusting screw

clockwise increases the outlet pressure.

Adjustment screw

Valve spring

Diaphragm

Steam flow

Controlled outlet pressure

Fig. 3 How the SRV66HC works

Rotating the adjusting screw clockwise

increases the outlet pressure.

4. Operation

IM-P186 -11 CTLS Issue 2 9

SRV66HC High Capacity Sanitary Pressure Reducing Valve

5.1 Start-up and adjustment:

-First make sure that all stop valves are closed.

-Check that the control spring is not compressed, wind the adjuster screw anticlockwise if necessary.

-Open the stop valves in the following order:

i-Open the stop valve (A) immediately in front of the steam trap.

ii -Open the downstream stop valve (B).

iii -Very gently open the upstream valve (not shown) on the inlet supply line to avoid any sudden

mechanical or thermal shock.

-Slowly turn the adjuster screw clockwise until the desired downstream pressure is achieved (C). If the

valve is set under no-load conditions then there will be a proportional offset causing the controlled pressure

to drop by about 20% under flowing conditions.

If the valve is set under normal flowing conditions then there will be a pressure rise of about 20% due to

the proportional offset of the valve as the load reduces to zero. It is important that any downstream safety valve

(D) is set such that the no-load set pressure of the SRV66HC (E) is below the safety valve reseat pressure.

Fig. 4 SRV66HC - Commissioning

Steam flow

5. Commissioning

Bypass for maintenance

IM-P186 -11 CTLS Issue 2

SRV66HC High Capacity Sanitary Pressure Reducing Valve

6.1 General inspection

While a programme of planned maintenance is always recommended, the Spirax Sarco SRV66HC will give

long and trouble free service if correctly selected, installed and kept free of dirt and foreign matter. Dirt and

foreign matter are most likely to collect during installation and later trouble can be avoided by inspecting

the installation after a few days.

Check the following:

-Clean all pipeline filters or strainers (remove elements or screens to clean).

-Check all joints for leakage.

6.2 Inspecting/replacing diaphragm and valve assembly:

-Before attempting any maintenance operation read the product specific safety information in Section 1.15.

-Isolate the valve, first closing the upstream isolating valve (A) and then the downstream isolating valve

(B). Check that the pressure is zero (C) and allow the valve to cool (see Figure 5).

-Release the compression on the control spring (6) by turning the adjustment screw (19) anticlockwise.

-Remove the SRV66HC from the pipeline.

-Lift off the spring housing (7) and the control spring (6) by first releasing the 'V' band clamp screws and

then removing the 'V' band (18).

-Grip the flats visible on the main valve end and undo the lock-nut (16) clamping the diaphragm (12) and

diaphragm plates (3 and 4). Please note: that when refitting the diaphragm plates the side with the

radius should abut the diaphragm face.

-The diaphragm and diaphragm plates (12, 3and 4) can then be removed from the main valve which

should be carefully lowered and removed via the valve inlet.

Note the diaphragm 'O' ring seal (17) which sits against the diaphragm PTFE face on the wetted side.

-Reassemble in reverse order ensuring the PTFE (light colour) side of the two-part diaphragm is on the

wetted side.

Fig. 5 Isolate the valve

6. Maintenance

Steam flow

Bypass for maintenance

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