Spirax Sarco - Catalogo Agosto 2017

Steam

saturation

curve

7.6.5 Pipeline ancillaries

Disc, split disc and wafer check valves

DCV4

Disc Check Valve

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification without notice.

TI-P134-04

ST Issue 11

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 it will be supplied with a metal-to-metal seat for

use on steam applications. Where it will be used on oil, air, gas

and water applications, alternative seat material is available

- see 'Optional extras'.

Optional extras

High temperature springs for temperatures up to 400°C.

Viton soft seats for oils, air and gas applications.

EPM soft seats for water applications.

Standards

This product fully complies with the requirements of the

European Pressure Equipment Directive 97/23/EC.

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.

Sizes and pipe connections

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

Suitable for installation between ASME 150 or ASME 300 flanges.

Standard shut-off

Materials

No. Part

1 Body

2 Disc

3 Spring retainer

Standard spring

High temp. spring

Operation

Material

Austenitic stainless steel

Nickel alloy

ASTM A351 CF3M

ASTM A276 316

BS 1449 316 S11

BS 2056 316 S42

Nimonic 90

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Pressure bar g

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

423

Pressure / temperature limits

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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

49 bar g @ 37°C

400°C @ 29 bar g

-29°C

49 bar g @ 37°C

300°C @ 31.5 bar g

400°C @ 29 bar g

-29°C

Note: For lower operating temperatures consult Spirax Sarco

PMA Maximum allowable pressure

TMA Maximum allowable temperature

Minimum allowable temperature

PMO

Maximum operating pressure

for saturated steam service

Maximum

TMO operating

Standard spring

High

temperature

spring

temperature

Minimum operating temperature

Without spring

Viton seat

-25°C to +205°C

Temperature limits

Designed for a maximum cold hydraulic test pressure of 76 bar g

EPDM seat

-40°C to +120°C