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

TI-P205-01

CH Issue 10

DEP7

SG Iron

Excess Pressure Valve

Description

The DEP7 is an SG iron direct acting bellows sealed excess pressure valve. The standard version has 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. DEP7B1N

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 for further 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. Note: All certification/inspection requirements must be stated at

the time of order placement.

Available types:

DN15 to DN50 screwed connections and DN15 to DN100 flanged connections.

The DEP7 is also available in a choice of 6 pressure ranges (suffix 1 - 6):

Upstream pressure ranges:

Range Valve type

1

DEP7B1

2

DEP7B2

3

DEP7B3

4

DEP7B4

5

DEP7B5

6

DEP7B6

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

DN15 - DN40

Pressure range (bar)

DN50 - DN80

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

0.1 -

0.2 -

0.5 -

1.4 -

3.2 -

7.0 -

0.5

0.8

1.7

3.4

7.5

16.0

0.1 -

0.2 -

0.4 -

1.0 -

2.3 -

5.0 -

0.3

0.5

1.3

2.6

5.5

15.0

Pressure / temperature limits

Sizes and pipe connections

1⁄2", 3⁄4", 1", 11⁄4", 11⁄2" and 2"

Screwed: BSP (BS 21 parallel), NPT also available

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

Standard flanges: EN 1092 PN16 or PN25

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A-D-E Flanged EN 1092 PN25

A-C-G Flanged EN 1092 PN16

A-B-F Flanged ASME 150

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

on intermittent 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.

Flanges available on request: ASME 150 and JIS

A

B

C

D

Steam

saturation

curve

G

F

E

Screwed

1⁄2" to 2"

Kvs values

Size DN 15

20 25

Flanged

DN15 to DN100

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Pressure bar g

The product must not be used in this region.

Body design conditions

Maximum design pressure

Maximum design temperature

Minimum design temperature

PN25

25 bar g @ 100°C

300°C @ 17.5 bar g

0°C

EPDM diaphragm

125°C

Nitrile diaphragm

90°C

Maximum operating temperature

Minimum operating temperature (ambient)

0°C

Note: For lower operating temperatures consult Spirax Sarco

Maximum differential pressure

DN15-DN50

25 bar

32

40 50

65 80 100

DN65-DN100

20 bar

Designed for a maximum cold hydraulic test pressure of 38 bar g

Note: With internals fitted, test pressure must not exceed 25 bar g

Kvs

3.4 6.5 11.4

16.4 24 40

used for safety valve sizing purposes where they are required.

58 92 145

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

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