INSTRUCTIONS
SELECTION
This product is to be used with clean fresh water.
Choose the valve in line with the data of nominal running (system rated pressure, and max temperature).
In no case shall the pressure of the machine exceed the permissible pressure printed on valve body.
The C2.002 valve prevents pressure spikes while the machine is in operation.
To do this, the valve must be fitted following these instructions.
INSTALLATION
The C2.002 valve is a protective element of the system.
There are three installation areas, depending on the system part that needs to be protected:
A) It can be fitted on the pump head before the unloader valve or the regulator valve. This is to
achieve an optimal protection of the pump and the initial circuit side.
B) On cold systems, it can be fitted after the unloader valve or regulator valve. In this way the secondary line (from the unloader to the gun) is protected from harmful overpressure caused by malfunctions or by an incorrect pressure adjustment in the system.
C) on hot water systems, the valve can be fitted after the burner where its potential activation, involving an abundant flow of water in by-pass, removes heat from the system thus protecting it thermally.
PRESSURE ADJUSTMENT/SETTING
The adjustment screw is to be found on the hose barb side. To adjust the screw, use a CH 2.5 Allen wrench.
When turning the screw clockwise, the pressure rises, when turning it anti-clockwise, the pressure drops.
Calibration of the valve must be carried out slowly, with small movements (pressure varies approximately 100bar – 10MPa for each turn of the screw); check the adjustment process by using a pressure sensor inserted on the side which needs to be protected.
IMPORTANT: do not stand in front of valve or let hands cross water discharge path during setting operations.
1. To maintain pressure settings for longer, let the valve release and unload flow completely before calibration. To do this, follow these steps accurately. With the spring totally released, screw in the plug for one turn. Turn on the pump and, with gun in operation, increase system pressure until the C2.002 valve releases and unloads flow completely. Then, turn off the pump.
2. Perform a preliminary calibration by screwing in the adjustment screw, until the VS28 valve is set at a pressure 50 bar – 5 MPa higher than the desired setting pressure. Please note that, from a position of completely released spring, 1 turn ≈ 100bar – 10MPa.
3. Set the gun in operation and turn on the pump: working on the primary regulator valve of the system, reach the desired calibration pressure.
4. Working on the valve adjustment screw with an Allen wrench, gradually unscrew until water starts to drip out.
5. Lower system pressure of about 10% of calibration pressure and turn off the pump. With gun in operation, turn on the pump again and verify valve sealing.
The final calibration pressure must be at least 20% higher than the maximum pressure occurring in the side protected by the VS28 but in any case not superior to the maximum pressure lay-out of the system.
After calibration, paint the adjustment screw to make sure settings are sealed.
IMPORTANT: the relief valve is a secondary safety device and shall not replace an unloader valve.
OPERATION:
In case of overpressure, the protection valve intervenes by opening a by-pass. To reset to operating pressure, it is necessary to turn off the pump, in order to allow the shutter to close down: then search for the problem source and only then, turn on the pump again.
