Spirax Sarco DCV8 Manuale utente

IM-P601-02 CMGT Issue 7

1. Safety information

2. General product information

3. Installation

4. Commissioning

5. Operation

6. Maintenance

7. Spare parts

Printed in France

6010050/7

DCV8

Disc Check Valve

Installation and Maintenance Instructions

IM-P601-02

CMGT Issue 7

IM-P601-02 CMGT Issue 7

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IM-P601-02 CMGT Issue 7

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

category:

Product Group 1

Gases

Group 2

Gases

Group 1

Liquids

Group 2

Liquids

DCV8

DN15 - DN25 SEP SEP SEP SEP

DN32 2SEP SEP SEP

DN40 - DN50 2 1 SEP SEP

DN65 - DN80 212SEP

DN100 212SEP

i) The product has been specifically designed for use on steam, compressed air, 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 stream 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. Safety information

IM-P601-02 CMGT Issue 7

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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 the danger of burns and consider

whether protective clothing (including safety glasses) is 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.

IM-P601-02 CMGT Issue 7

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 300 °C (572 °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

This product is recyclable. No ecological hazard is anticipated with the disposal of this product

providing due care is taken, except:

Viton seat:

- Waste parts can be landfilled, when in compliance with National and Local regulations.

- Parts 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.

- Parts are insoluble 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-P601-02 CMGT Issue 7

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2.1 Description

DCV8 disc check valves are of a wafer pattern, designed to be sandwiched between DIN 2501 and EN 1092

flanges. Their function is to prevent reverse flow on a wide variety of fluids. The DCV8 is designed for use with

agressive fluids, vapours, acids and alkalines at high pressures and temperatures. The valves are provided

with an M8 threaded tapping for product earthing and conform to EN 558 part 1, series 49.

Standards

Designed and manufactured in accordance with ÄD Merkblatter. This product fully complies with the

requirements of the Pressure Equipment Directive (PED).

Standard shut-off

Standard valves conform to EN 12266-1 rate D.

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

Certification

These products are available with certification to EN 10204 3.1. and the body is sourced from a TÜV

approved foundry.

Note: All certification/inspection requirements must be stated at the time of order placement.

Note: For additional product data see Technical Information Sheet TI-P147-01-EN-ISS1.

2.2 Sizes and pipe connections

DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80 and DN100.

Suitable for installation between the following flanges:

EN 1092/DIN 2501 PN10, PN16, PN25 and PN40.

Fig. 1 DCV8 disc check valve

2. General product information

IM-P601-02 CMGT Issue 7

2.3 Optional extras

Heavy duty springs (700 mbar opening pressure, up to DN65) for boiler feed applications

High temperature springs

Viton soft seats for oils and gas applications

EPDM soft seats for water applications

2.4 Materials

Part Material

Body Austenitic stainless steel

Disc Austenitic stainless steel

Spring retainer Austenitic stainless steel

Standard spring Austenitic stainless steel

Heavy duty 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

'H' - Heavy duty spring - Metal disc seat

'V' - Standard spring - Viton disc seat

'E' - Standard spring - EPDM disc seat

No identification indicates a standard spring with a metal disc.

IM-P601-02 CMGT Issue 7

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400

300

200

100

-196

700

600

500

400

300

200

100

-320

0 5 10

20 25 30 35 40

0 100 200 300 400 500 580

The product must not be used in this region.

DWithout standard or high temperature springs.

DStandard spring and heavy duty spring.

Body design conditions PN40

PMA Maximum allowable pressure 40 bar g @ 50 °C (580 psi g @ 122 °F)

TMA Maximum allowable temperature 400 °C @ 25.6 bar g (752 °F @ 371 psi g)

Minimum allowable temperature -196 °C (-320 °F)

PMO Maximum operating pressure (bar g) 40 bar g @ 50 °C (580 psi g @ 122 °F)

TMO Maximum operating

temperature

Standard spring 300 °C @ 27.6 bar g (572 °F @ 400 psi g)

Heavy duty spring 300 °C @ 27.6 bar g (572 °F @ 400 psi g)

High temperature spring 400 °C @ 25.6 bar g (752 °F @ 371 psi g)

Without spring 400 °C @ 25.6 bar g (752 °F @ 371 psi g)

Minimum operating temperature (standard disc) -196 °C (-320 °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: 60 bar g (870 psi g)

Note: Special testing to allow lower temperature operation can be provided at extra cost. Consult Spirax Sarco.

Temperature °C

Pressure bar g

Steam

saturation

curve

E C

Pressure psi g

Temperature °F

2.6 Pressure/temperature limits

Note: Special testing to allow lower temperature operation can be provided at extra cost. Consult Spirax Sarco.

IM-P601-02 CMGT Issue 7

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 protection film from all name-plates, where

appropriate, before installation on stream 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 2). 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 eg. torque tightening the bolts in opposite sequence.

3.6 The DCV8 can be fitted between EN 1092/DIN 2501 PN10, PN16, PN25 and PN40 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 2b). 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. 2

d e

'b'

is the only acceptable orientation when a DCV is supplied without an internal spring

3. Installation

IM-P601-02 CMGT Issue 7

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Fig. 3

Open Closed

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.

4. Commissioning

5. Operation

Kvvalues

Size DN15 DN20 DN25 DN32 DN40 DN50 DN65 DN80 DN100 For conversion:

Cv(UK) = Kvx 0.963

Cv(US) = Kvx 1.156

Kv4.4 6.8 10.8 17 26 43 60 80 113

Opening pressures in mbar

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

Flow direction

Direction DN15 DN20 DN25 DN32 DN40 DN50 DN65 DN80 DN100

25 25 25 27 28 29 30 31 33

22.5 22.5 22.5 23.5 24.5 24.5 25 25.5 26.5

20 20 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 3.5 44.5 55.5 6.5

Heavy duty springs approximately 700 mbar

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