The VQP/VQI46.. PICVs are maintenance-free without differential pressure regulator.
Valve plug stem, presetting, diaphragm etc. may not be disassembled.
- Switch off the pump and disconnect power supply.
- Close the shut-off valves in the piping network.
- Fully reduce pressure in the piping network and allow the pipes to cool down completely.
Differential pressure regulator cleaning
General notes
The valve insert with the differential pressure regulator can be removed for replacement or cleaning. The removal of the valve from the pipeline is not necessary for this operation. For the cleaning process of the differential pressure regulator, a special tool is needed (ALP54, see Accessories).
Disassemble | ||
|---|---|---|
1. Loosen the knurled nut | 2. Place the special tool on the On/Off bonnet | 3. Loosen the On/Off bonnet |
|
|
|
4. Remove the On/Off bonnet from the valve housing | 5. Place the 19 mm top on the differential pressure regulator | 6. Loosen the differential pressure regulator |
|
|
|
7. Remove the differential pressure regulator from the valve housing |
| |
| ||
Assemble | ||
|---|---|---|
1. Insert the differential pressure regulator and tighten the differential pressure regulator to stop | 2. Loosen the differential pressure regulator until the marking on the differential pressure regulator is aligned against the flow direction | 3. Orient the indicator in fully open position to presetting |
|
|
|
Insert the On/Off bonnet and tighten with 20 Nm |
| |
| ||
Sealing gland
The stem sealing gland cannot be exchanged. Should leakage occur, the whole valve must be replaced.