Spirax Sarco DCV4 Manuale utente

IM-P134-08 CMGT Issue 10 1

1. Safety information

2. General product information

3. Installation

4. Commissioning

5. Operation

6. Maintenance

7. Spare parts

Printed in GB

1348050/10

DCV4

Disc Check Valve

Installation and Maintenance Instructions

IM-P134-08

CMGT Issue 10

IM-P134-08 CMGT Issue 10

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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.

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 listed below complies with the requirements of the Pressure Equipment Directive

(PED) and carries the mark when so required. The product falls within the following Pressure

Equipment Directive categories:

Product Group 1

Gases

Group 2

Gases

Group 1

Liquids

Group 2

Liquids

DCV4

DN15 - DN25 SEP SEP SEP SEP

DN40 2 1 SEP SEP

DN50 - DN100 212SEP

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

condensate which are in Group 2 of the above mentioned Pressure Equipment Directive.

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.

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. Safety information

IM-P134-08 CMGT Issue 10 3

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 and consider

whether protective clothing (including safety glasses) are required.

Viton seat:

If the Viton seat has been subjected to a temperature approaching 315 °C (599 °F) or higher it may

have decomposed and formed hydrofluoric acid. Avoid skin contact and inhalation of any fumes

as the acid will cause deep skin burns and damage the respiratory system.

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.

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.

IM-P134-08 CMGT Issue 10

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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 400 °C (752 °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. However, if

the valve is fitted with a Viton or PTFE seat, special care must be taken to avoid potential health

hazards associated with decomposition/burning of these seats.

Viton:

-Can be landfilled, when in compliance with National and Local regulations.

-Can be incinerated, but a scrubber must be used to remove Hydrogen Fluoride, which is evolved

from the product and with compliance to National and Local regulations.

-Is insoluable in aquatic media.

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-P134-08 CMGT Issue 10 5

2.1 General description

The DCV4 stainless steel disc check valve is of the wafer pattern designed to be sandwiched between ASME

flanges. It is suitable for use on a wide range of fluids for applications in process lines, hot water systems,

steam and condensate systems etc. Face-to-face dimensions conform to EN 558 part 2, Series 52.

As standard the valves will be supplied with a metal-to-metal seat for use on steam applications. Where

they are being used on oil, air, gas and water applications, alternative seat material is available - see

Section 2.5.

Standards

This product fully complies with the requirements of the Pressure Equipment Directive (PED).

Standard shut-off

Standard valves conform to EN 12266-1 rate E.

Valves conforming to EN 12266-1 rate D are available on request.

Soft seated versions meet EN 12266-1 rate A, providing a differential pressure exists.

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 additional product information see Technical Information Sheet TI-P144-01-EN-ISS1.

2.2 Sizes and pipe connections

DN15, DN20, DN25, DN40, DN50, DN80 and DN100.

Suitable for installation between ASME 150 or ASME 300 flanges.

2.3 Optional extras

High temperature springs for temperatures up to 400 °C (752 °F).

Viton soft seats for oils and gas applications.

EPDM soft seats for water applications.

Fig. 1

2. General product information

IM-P134-08 CMGT Issue 10

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2.4 Materials

Part Material

Body Austenitic stainless steel

Disc Austenitic stainless steel

Spring retainer Austenitic stainless steel

Standard spring Austenitic stainless steel

High temperature spring Nickel alloy

2.5 Seating options

The valves are stamped to identify the internals fitted:

'N' -High temperature spring -Metal disc seat

'W' -Without spring -Metal disc seat

'V' -Standard spring -Viton disc seat

'E' -Standard spring -EPDM disc seat

'WV' -Without spring -Viton disc seat

'WE' -Without spring -EPDM disc seat

'T' -Valves tested to EN 12266-1 Rate D

No identification indicates a standard spring with a metal disc.

IM-P134-08 CMGT Issue 10 7

The product must not be used in this region.

A-B-D High temperature spring and without spring.

E-C-D Standard spring.

Please note: The figures displayed are only relevant when a metal-to-metal seat is used. If Viton or EPDM

seats are used the product is restricted to the limits of the seat material chosen.

Body design conditions for saturated steam service ASME 300

PMA Maximum allowable pressure 49 bar g @ 37 °C (710 psi g @ 98 °F)

TMA Maximum allowable temperature 400 °C @ 29 bar g (752 °F @ 420 psi g)

Minimum allowable temperature -29 °C (-20 °F)

PMO Maximum operating pressure for saturated steam

service 49 bar g @ 37 °C (710 psi g @ 98 °F)

TMO Maximum operating

temperature

Standard spring 300 °C @ 31.5 bar g (572 °F @ 457 psi g)

High temperature spring 400 °C @ 29 bar g (752 °F @ 420 psi g)

Without spring 400 °C @ 29 bar g (752 °F @ 420 psi g)

Minimum operating temperature

Note: For lower operating temperatures consult Spirax Sarco -29 °C (-20.2 °F)

Temperature limits

Viton seat -25 °C to +205 °C (-13 °F to +401 °F)

EPDM seat -40 °C to +120 °C (-40 °F to +248 °F)

Designed for a maximum cold hydraulic test pressure of 76 bar g (1 102 psi g)

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Pressure bar g

Temperature °C

Steam

saturation

curve

Pressure psi g

Temperature °F

2.6 Pressure/temperature limits

IM-P134-08 CMGT Issue 10

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2.7 Body marking information

Fig. 2

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Rolled body markings and description

DN15

DCV4 ASME 300 A351

CF3M

Made in

France BS 7438

A B C D E F G H I

DNX

DCV4

Flow

direction

Design

pressure

Material

standard

Grade

Country of

manufacture

Standard

applicable

Melt

number

Identity of

Foundry

IM-P134-08 CMGT Issue 10 9

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

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

check that the product is suitable for the intended installation:

3.1 Check materials, pressure and temperature and their maximum values. If the maximum operating

limit of the product is lower than that of the system in which it is being fitted, ensure that a safety

device is included in the system to prevent overpressurisation.

3.2 Determine the correct installation situation and the direction of fluid flow.

3.3 Remove protection covers from all connections and protective film from all name-plates, where

appropriate, before installation on steam or other high temperature applications.

3.4 Valves must only be installed where 'weld neck' flanges are used. Other flange types may restrict

operation.

3.5 Disc check valves simply fit between two pipe flanges (see Figure 3). Standard gaskets are used

either side of the valve together with longer bolts or studs.

Note: flanges, bolts (or studs), nuts and joint gaskets to be provided by the installer. Normal sensible

flange bolting practice should be followed e.g. torque tightening the bolts in opposite sequence.

3.6 The DCV4 can be fitted betwen ASME 150 or 300 flanges. They can be installed in any plane with

the exception of DCV's supplied without an internal spring. These must be fitted in a vertical flow

line with the flow from bottom-to-top i.e. upward flow (see Figure 3b). Disc check valves must be

fitted in accordance with the direction of the flow arrow on the body, indicating correct fluid flow

direction.

Note: Disc check valves are not suitable for use where heavily pulsating flow exists, such as close to a

compressor.

Fig. 3

a b c

'b' is the only acceptable

orientation when a DCV is supplied without an internal

spring

3. Installation

IM-P134-08 CMGT Issue 10

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After installation or maintenance ensure that the system is fully functional. Carry out tests on any alarms or

protective devices.

Disc check valves are opened by the pressure of the fluid and closed by the spring as soon as the flow ceases

and before the reverse flow occurs.

Open Closed

4. Commissioning

5. Operation

Kvvalues

DN 15 20 25 40 50 80 100

Kv4.4 7. 5 12 26 39 84 150

For conversion:

Cv(UK) = Kvx 0.963

Cv(US) = Kvx 1.15 6

Opening pressures in mbar

Differential pressures with zero flow for standard and high temperature springs.

Flow direction

DN 15 20 25 40 50 80 100

25 25 25 28 29 31 33

22.5 22.5 22.5 24 24.5 25.5 26.5

20 20 20 20 20 20 20

Where lowest opening pressures are required, valves without springs can be installed in vertical pipes with

bottom-to-top flow.

Without spring

2.5 2.5 2.5 4.0 4.5 5.5 6.5

Fig. 4

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