Spirax Sarco - Catalogo Agosto 2017

7.6.3

Steam

saturation

curve

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Pipeline ancillaries

Disc, split disc and wafer check valves

DCV3 and DCV3LT

Disc Check Valves

The DCV3LT is

supplied with

'LT' stamped

on the unit.

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-P134-50

ST Issue 7

Description

The DCV3 and DCV3LT disc check valves are of the wafer pattern

designed to be sandwiched between flanges. They are 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 1, series 49.

As standard they 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 'Optional extras'.

Optional extras

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

for boiler feed applications.

Viton soft seats for oil, air and gas applications.

EPDM soft seats for water applications.

Standards

These products fully comply with the requirements of the

European Pressure Equipment Directive 97/23/EC.

Standard valves conform to EN 12266 rate E.

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

Soft seated versions meet EN 12266 rate A, providing a

differential pressure exists.

Certification

These products are available with a Typical Test Report.

The products are also available with certification to EN 10204 3.1.

Note: Allcertification/inspection requirements must be stated

at the time of order placement.

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

Suitable for installation between BS 10 Tables 'E' and 'H',

EN 1092 PN6, PN10, PN16, PN25 and PN40;

JIS 5, JIS 10, JIS 16, JIS 20 flanges with the following exceptions:-

DN40, DN50, DN80 and DN100 - will not fit between JIS 5 flanges

DN65 and DN80 - will not fit between BS 10 'E' flanges.

Standard shut-off

Pressure / temperature limits

Sizes and pipe connections

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A-B-F DCV3 without spring and with high temperature spring.

A-B-D DCV3LTwithoutspring.

E-C-F DCV3 with standard spring and heavy duty spring.

E-C-D DCV3LT with 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.

Materials

No. Part

1 Body

2 Disc

3 Spring retainer

Standard spring

4 Heavy duty spring

High temp. spring

Material

Austenitic stainless steel

Nickel alloy

WS 1.4581

ASTM A276 316

BS 1449 316 S11

BS 2056 316 S42

Nimonic 90

Body design conditions

PMA Maximum allowable pressure

TMA Maximum allowable temperature

PN40

40 bar g @ 50°C

400°C @ 31.2 bar g

Pressure bar g

The product must not be used in this region.

Use either a DCV3 with high temperature spring or

DCV3 / DCV3LT without spring for use in this area.

Note: Special testing to allow lower temperture operation can be

Minimum allowable temperature

DCV3

-10°C

DCV3LT

-60°C

provided at extra cost. Consult Spirax Sarco

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

PMO

Maximum operating pressure

(metal-to-metal seat)

40 bar g @ 50°C

300°C @ 33.3 bar g

Operation

Standard spring

Heavy duty spring

Maximum

TMO operating

Note: For lower operating

temperatures consult Spirax Sarco

300°C @ 33.3 bar g

DCV3 only 400°C @ 31.2 bar g

temperature

Minimum operating temperature

400°C @ 31.2 bar g

-10°C

-60°C

High

temperature

spring

Without spring

DCV3

DCV3LT

-25°C to +205°C

-40°C to +120°C

Designed for a maximum cold hydraulic test pressure of 60 bar g

Temperature limits

Viton seat

EPDM seat