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Pressure relief valve type V 85 and type V 185
Maintenance manual and mounting instructions
V 185 (DN 15 – DN 50)
Disassembling the valve
Attention: Never dismantle the valve when the pipe is
under pressure.
„ Put the valve in an upright position, turn off cap 8.
„ Release counter nut on adjusting screw 7 and turn
the screw counterclockwise until the compression
spring 5 is completely relieved.
„ Loosen the connecting screw 9 on the housing and
lift off the upper part of the valve.
„ Remove: spring plate 6, pressure spring 5, thrust
piece 4, diaphragm 3 and piston (type V 85; s.p. L7 – 12).
Assembling of the valve
„ The valve assembly is to be performed in reverse
order to the disassembly.
„ Before the assembly all parts have to be checked
for damages.
„ All parts have to be clean.
„ Screws 9 have to be mounted evenly and crosswise
according to the torques (see above).
„ After assembly carry out a pressure test acc. to
DIN EN 12266-1.
Trouble shooting
Disorder
Leakage on the adjusting screw
Leakage between upper and lower part
Valve does not close properly
L7 – 12
Tightening torque Md
for body connection in Nm
DN
Md
Notes for correct installation
„ Installation and operation should be performed by qualified
personnel and in compliance with all safety regulations
(eg UVV etc.) and common technical rules.
„ The valve must be installed stress-free in the pipeline
(plane parallelism, axial, length). If possible, use three de-
tachable pipe connections (flange or screw connection).
„ Flange connection:
Connecting bolts have to be tighten evenly crosswise
(observe the tightening torques of the screws). For plastic
flanges in general washers have to be provided for bolts
and nuts.
„ Cement / welding socket, cement / welding spigot:
For the gluing or welding connection the relevant
guidelines (e.g. DVS) have to be noted.
„ Before commissioning the bolt torques on the
housing must be checked and retightened if necessary.
Adjusting the working pressure
„ Remove cap 8, loosen lock nut.
„ Increace working pressure:
Turn adjusting screw 7 clockwise.
Decrease working pressure:
Turn adjusting screw 7 counterclockwise.
„ Lock adjusting screw 7 with lock nut and mount cap 8.
Maintenance
„ The valves are nearly maintenance-free.
„ For heavily soiled and particle-carrying media, depending
on the degree of soiling, cleaning is recommended at
appropriate intervals.
„ For cleaning, disassemble the valve into individual parts
(for instructions, see „Disassembling the valve").
„ Depending on the operating conditions and operating
time, various components may show signs of wear.
„ As spare parts we recommend: diaphragm 3,
compression spring 5, adjusting screw 7 with nut.
Cause
Diaphragm defective
Housing screws loose
Sealing seat is dirty or damaged
Plastic valves
15/20
25/32
40
50
9
12
20
20
Elimination
Replace diaphragm
Retighten screws acc.
table screw tightening torques
Clean sealing seat and check for damages
Errors and omissions excepted
65
80
100
29
29
29
11/2020
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