A

Steam

saturation

curve

E

B

C

Control valves

Pressure reducing/surplussing valves

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.

© Copyright 2013

D

TI-P206-01

CH Issue 12

DEP4

Cast Steel

Excess Pressure Valve

Description

The DEP4 is a cast steel direct acting bellows sealed excess pressure valve. The standard version as an EPDM diaphragm (limited

to 125°C) and is suitable for steam and water applications. Also available for oil applications is a Nitrile rubber diaphragm (suffix 'N'

i.e. DEP4B1N which is limited to 90°C).

Note: To protect the actuator diaphragm on steam applications a WS4 water seal pot must be installed in the downstream

pressure signal line to the actuator. Refer to TI-S12-03 details.

Standards

The products listed below comply with the requirements of the European Pressure Equipment Directive 97/23/EC and carry the

mark

when so required.

Certification

This product is available with a manufacturers' Typical Test Report and a certifcate of conformity to EN 10204 3.1 as an optional extra.

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

PN

DN100

Rating

0.1 - 0.3

2.5

0.2 - 0.5

2.5

0.4 - 1.0

6

0.8 - 2.5

16

2.3 - 5.0

25

4.0 - 10.0

25

40 50 65 80 100

Available types:

DN15 - DN100 flanged connections having 6 pressure ranges (suffix 1 - 6).

Upstream pressure ranges:

Range

Valve type

1

DEP4B1

2

DEP4B2

3

DEP4B3

4

DEP4B4

5

DEP4B5

6

DEP4B6

Actuator

type

11 or 11N

12 or 12N

13 or 13N

14 or 14N

15 or 15N

15 or 15N

Spring

colour

Yellow

Yellow

Blue

Blue

Blue

Red

Pressure range (bar)

DN15 - DN40

DN50 - DN80

0.1 -

0.2 -

0.5 -

1.4 -

3.2 -

7.0 -

0.5

0.1 - 0.3

0.8

0.2 - 0.5

1.7

0.4 - 1.3

3.4

1.0 - 2.6

7.5

2.3 - 5.5

16.0

5.0 - 15.0

Sizes and pipe connections

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

Standard flange: EN 1092 PN40

Flanges available on request: ASME 150, ASME 300 and JIS.

Pressure / temperature limits

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The product must not be used in this region.

A-C-D Flanged EN 1092 PN40 and ASME 300

Note: In the case of liquid service, this product is to be used

only on intermittant duty. Applications such as continuous pump

recirculation may cause valve and pipework damage due to

cavitation which is not covered under the terms of our warranty.

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Pressure bar g

A-B-E Flanged PN16

Body design conditions

Maximum design pressure

Maximum design temperature

Minimum design temperature

Maximum operating temperature

PN40

40 bar g @ 50°C

300°C @ 25.8 bar g

0°C

EPDM diaphragm

125°C

Nitrile diaphragm

90°C

Minimum operating temperature (ambient)

0°C

Note: For lower operating temperatures consult Spirax Sarco

Maximum differential pressure

DN15-DN50

25 bar

Kvs values

Size DN 15

20 25

32

DN65-DN100

20 bar

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

Note: With internals fitted, test pressure must not exceed 40 bar g

Kvs

3.4 6.5 11.4 16.4

24 40

58 92 145

be used for safety valve sizing purposes where they are required.

Note: The Kvs values shown above are full capacities and should

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4.6.54

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e

m

p

e

r

a

t

u

r

e

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