Maintenance Instructions Dn 125-200; Maintenance To Be Carried Out Every 12 Month; Maintenance To Be Carried Out Every 3 Years - Watts DRVD Installation Manual

6. Maintenance instructions DN 125-200

6.1 Maintenance to be carried out
every 12 months
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 (150) (turn the
adjuster screw (110) anti-clockwise),
3- Remove the valve head fixing screws
(270) and then the valve head (20),
4- Remove the spring and washers
(150-50),
5- Remove the inspection cover (30),
6- Remove the nut (140), the seal-
holder (70), the disc (60) and the
seal (160),
7- Remove the piston (40) from above,
8- Remove the lipped seal (170),
clean and grease the seals, the seal
mating surfaces and seal grooves,
then fit the new seal,
9- Refit the piston, taking 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.

6.2 Maintenance to be carried out every 3 years

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 (150) (turn the adjuster screw (110) anti-clockwise),
3- Remove the valve head fixing screws (270) and then the valve head (20),
4- Remove the spring and washers (150-50),
5- Remove the inspection cover (30),
6- Remove the nut (140), the seal-holder (70), the disc (60) and the seal (160),
7- Remove the piston (40) from above,
8- Remove the seals (170-180-260), clean and grease the seals, 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 (160),
11- Refit in reverse order to removal,
12- Re-fill with water and adjust as per the instructions provided above.
6
EN
10 valve housing
20 valve head
30 plate
40 piston
spring end
50
washer
60 closing system
70 seal-holder
80 upper ring
90 lower ring
100 seat
110 adjuster screw
120 ring
130 shaft
140 nut
150 spring
160 flat seal
170 lipped seal
180 lipped seal
190 O-ring
200 O-ring
210 O-ring
220 O-ring
230 fixing screw
240 lock-nut
pressure
250
connection
260 segment
270 fixing screw