Spirax Sarco - Catalogo Agosto 2017

Steam

saturation

curve

7.6.11 Pipeline ancillaries

Disc, split disc and wafer check valves

DCV6

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-P134-26

ST Issue 8

Description

The DCV6 stainless steel disc check valve is of the wafer pattern

designed to be sandwiched between flanges. It is suitable for use

on a wide range of fluids for applications in process lines, hot water

systems, steam and condensate lines etc. They have an increased

gasket face area compared to the DCV3, with face-to-face

dimensions conforming 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 is being used on oil, air,

gas and water applications, alternative seat material is available -

see 'Optional extras'.

Optional extras

Heavy duty springs (700 mbar opening pressure, up to DN65)

for boiler feed applications

High temperature springs for temperatures up to 400°C.

Viton soft seats for oil, gas and air applications.

EPDM soft seats for water applications.

This product fully complies with the requirements of the

European Pressure Equipment Directive 97/23/EC.

Standard valves conform to EN 12266-1 rate D.

Soft seated versions meet EN 12266-1 rate A, providing a

differential pressure exists.

This product is available with certification to EN 10204 3.1.

Note: Allcertification/inspection requirements must be stated

at the time of order placement.

Sizes and pipe connections

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

Suitable for installation between the following flanges:

EN 1092 PN10, PN16, PN25 and PN40,

JIS 10K, JIS 16K, JIS 20K, JIS 30K and JIS 40K,

Note: Wafer check valves are not suitable for use where heavily

pulsating flow exists, such as close to a compressor.

Standards

Standard shut-off

Pressure / temperature limits

400

300

200

100

-10

Pressure bar g

The product must not be used in this region.

For use in this area use a DCV6 with high temperature

spring or DCV6 without spring.

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

E- C -D Standard spring and heavy duty 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.

Certification

KS 10K, KS 16K, KS 20K, KS 30K and KS 40K,

ASME B 16.5 Class 150 and Class 300

Note: DN80 and DN100 - will not fit between JIS 10K.

Flange face options: Flange faces may be machined to fit between

flanges according to DIN 2512, 2513, 2514 and ASME 150 / 300 RJ.

Materials

No. Part

1 Body

2 Disc

3 Spring retainer

Standard spring

4 Heavy duty spring

High temp.spring

Operation

Material

Austenitic stainless steel

Nickel alloy

WS 1.4581

ASTM A276 316

BS 1449 316 S 11

BS 2056 316 S 42

Nimonic 90

Body design conditions for

saturated steam service

PMA Maximum allowable pressure

TMA Maximum allowable temperature

Minimum allowable temperature

PMO

Maximum operating pressure

for saturated steam service

Standard spring

Heavy duty spring

High

temperature

spring

PN40 and ASME 300

40 bar g @ 50°C

400°C @ 22.4 bar g

-10°C

40 bar g @ 50°C

300°C @ 33.3 bar g

400°C @ 31.2 bar g

-10°C

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

Maximum

TMO operating

temperature

Minimum operating temperature

Without spring

Note: For lower operating temperatures consult Spirax Sarco

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