Control valves

Pressure reducing/surplussing valves

4.6.71

Spare parts

Available spares

Maintenance kit

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

* Main diaphragm

(2 off)

* Pilot diaphragm

(2 off)

Pilot valve seal assembly

* Pilot valve and plunger assembly

Main valve assembly

* Main valve return spring

Pressure adjustment spring

Red

Grey

Control pipe assembly

Balance pipe assembly

* Body gasket

(packet of

* Set of spring housing securing studs and nuts

(set of 4)

* Set of pilot valve housing securing studs and nuts

(set of 4)

(set of 10)

Set of diaphragm chamber securing bolts and nuts

(set of 12)

(set of 16)

(set of 20)

Set of main body studs and nuts (DN80)

(set of 6)

Pushrod and main diaphragm plate assembly

How to order spares

DP143, DP143G, DP143H

DP143, DP143G, DP143H

DN15 and DN20

DN25 and DN32

DN40 and DN50

DN80

0.2 to 17 bar

16 to 24 bar

A

B

C

D, E

F, H

G

J

K

M, N

O

P

Q

R

T

V, W, X

3)

Always order spares by using the description given in the column headed 'Available spares' and state the size and type of pressure

reducing valve.

Example: 1 - Main valve assembly for a Spirax Sarco DN15 DP143 pressure reducing valve.

How to fit. See the 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. DP143G Interchangeability is therefore

restricted to model type for some parts.

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

may not be compatible for interchangeability.

Size

**

DN15LC DN15

DN20 DN25 DN32 DN40 DN50 DN80

Maindiaphragm

a

a

a

b

b

c

c

d

Pilotdiaphragm

a

a

a

a

a

a

a

a

Pilot valve seal assembly

Pilot valve and plunger assembly

Main valve assembly

Main valve return spring

Pressure adjustment spring

† Control pipe assembly

† Balance pipe assembly

a

a

a

a

a

b

a

a

a

a

a

a

a

a

a

a

a

a

c

d

a

b

a

a

b

c

b

c

a

a

a

a

a

a

a

a

e

f

g

h

b

c

c

d

a

a

a

a

d

e

f

g

d

e

f

g

†Bodygasket

a

a

a

b

b

c

c

d

† 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

a

a

a

a

a

a

a

a

b

b

a

a

a

b

b

−

−

−

−

−

** Not available for the DP143G

a

a

a

c

c

d

c

c

d

−

−

a

TI-P006-01 CH Issue 13

DP143, DP143G, DP143H and DP143Y Pilot Operated Pressure Reducing Valves with Cast Steel Bodies

Page 8 of 9