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5. Maintenance instructions DN 50-100
5.1 Maintenance to be carried out every
12 months
Maintenance and assembly instructions:
1- De-presurise the device and then isolate
it from the system (remove from system if
necessary),
2- Fully release the spring (110) (turn the
adjuster screw (100) anti-clockwise),
3- Remove the valve head fixing screws (200)
and then the valve head (20),
4- Remove the spring and washers (110-40),
5- Open the plug (30) and remove the piston
assembly,
6- Remove the screw (200), the seal holder
(50) and the seal (140),
7- Remove the piston (60) from above,
8- Remove the lipped seal (160), clean and
grease the seals, the seal mating surfaces
and seal grooves, then fit the new seal,
9- Refit the piston - take care not to damage
the seals,
10- Refit in reverse order to removal,
11- Re-fill with water and adjust as per the
instructions provided above.
5.2 Maintenance to be carried out every 3 years
Maintenance and assembly instructions:
1- De-presurise the device and then isolate it from the
system (remove from system if necessary)
2- Fully release the spring (110) (turn the adjuster screw
(100) anti-clockwise)
3- Remove the valve head fixing screws (200) and then
the valve head (20)
4- Remove the spring and washer (110 / 40)
5- Remove the inspection cover (30)
6- Remove the screw (200), the seal-holder (50) and
the seal (140)
7- Remove the piston (60) from above
8- Remove the seals (150 – 160 – 195), clean and
grease the seal mating surfaces and seal grooves,
then fit the new seals
9- Refit the piston, taking care not to damage the
seals
10- Refit the new seal (140)
11- Refit in reverse order to removal
12- Re-fill with water and adjust as per the adjustment
procedures (see 3)
5.3 Modifying the adjustment range by changing the
spring kit
Maintenance and assembly instructions:
1- De-pressurise the system and then isolate the device from it
(remove from system if necessary)
2- Fully release the spring (110) (turn the adjuster screw (100)
anti-clockwise)
3- Remove the valve head fixing screws (200) and then the valve
head (20)
4- Remove the spring and washer (110 / 40)
5- Fit the new spring, with new washers if necessary
6- Refit in reverse order to removal
7- Re-fill with water and adjust as per the adjustment procedures
(see 3)
10
valve housing
20
valve head
30
plate
spring end
40
washer
50
seal-holder
60
guide
70
piston
80
spring mounting
90
seat
100
adjuster screw
110
spring
pressure con-
130
nection
140
seal
150
lipped seal
160
lipped seal
170
O-ring
180
O-ring
185
O-ring
190
O-ring
195
ring
200
fixing screw
210
fixing screw
220
lock-nut
5
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