Control valves

Pressure reducing/surplussing valves

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4.6.87

DN15LC

DN15

DN20

DN25

DN32

DN40

DN50

a

a

a

b

b

c

c

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

a

b

c

d

e

f

g

a

a

a

b

b

c

c

a

a

a

a

a

a

a

a

a

b

c

d

e

f

a

a

a

b

b

c

c

a

a

a

a

a

a

a

a

a

a

b

b

c

c

a

a

a

b

b

c

c

−

−

−

−

−

−

−

Spare parts

Available spares

Maintenance kit

A stand-by set of spares for general maintenance purposes and covers all spares marked*

* Main diaphragm

* Pilot diaphragm

Pilot valve seal assembly

* Pilot valve and plunger assembly

Main valve assembly

* Main valve return spring

Pressure adjustment spring

* Control pipe assembly

* Body gasket

Set of spring housing securing studs and nuts

Set of pilot valve housing securing studs and nuts

Set of diaphragm chamber securing bolts and nuts

Set of main body studs and nuts (DN80)

Pushrod and main diaphragm plate assembly

How to order spares

(2 off)

(2 off)

Red

Grey

(packet of

(set of 4)

(set of 4)

(set of 10)

(set of 12)

(set of 16)

(set of 20)

(set of 6)

A

B

C

D, E

F, H

G

0.2 to 17 bar

J

16 to 24 bar

3)

O

K

P

Q

R

T

V, W, X

size and type of pressure

DN15 and DN20

DN25 and DN32

DN40 and DN50

DN80

Always order spares by using the description given in the column headed 'Available spares' and state the

reducing valve.

Example: 1 - Main valve assembly for a Spirax Sarco DN15 SDP143 pilot operated pressure surplussing valve.

How to fit. See Installation and Maintenance Instructions supplied with the pressure reducing valve. Further copies are available on request.

Interchangeability of spares

The following table shows how in certain sizes some parts are interchangeable. For example in the line headed 'Main diaphragm' the

diaphragm used in the following sizes: DN15LC, DN15 and DN20 is common to these sizes by the letter 'a'. The letter 'b' indicates that

sizes DN25 and DN32 use one common diaphragm.

Some parts, particularly pilot and main valve assemblies are specific to particular models e.g 'SDP' 'G'. Interchangeability is therefore

restricted to model type for some parts.

† Please note for storage purposes: The spare parts marked † are not of the same material as those for the DP143 and DP163,

consequently, they are not compatible for interchangeability.

Size

Main diaphragm

Pilot diaphragm

Pilot valve seal assembly

Pilot valve and plunger assembly

Main valve assembly

Main valve return spring

Pressure adjustment spring

† Control pipe assembly

† Body gasket

† Set of spring housing securing studs and nuts

† Set of pilot valve housing securing studs and nuts

† Set of diaphragm chamber securing bolts and nuts

† Set of main body studs and nuts

SDP143 Pilot Operated Pressure Surplussing Valve with Cast Steel Body

DN80

d

a

a

a

h

d

a

g

d

a

d

d

a

TI-P004-01 CH Issue 6

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