Hydraulic Valves (HPV Series)

The operating principle of HPV hydraulic valves is as follows:
The fluid flows from the ‘inlet chamber’ to the ‘intermediate chamber’ through a port in the cover and then through a debris-proof filter. It then fills the ‘diaphragm chamber’ via a port. In the next step, it reaches the solenoid valve support block via a connection orifice. Inside the block, the fluid encounters two paths running parallel to each other to reach the “discharge chamber”. The fluid experiences pressure drops along this path depending on the opening level of the orifices and the opening of the valves. An intermediate pressure is established between the inlet pressure and the outlet pressure as a result of these pressure drops in the “diaphragm chamber”. In conjunction with the action of the spring, this pressure moves the axial position of the plug, which in turn influences the upstream/downstream pressure values of the valve and, therefore, also the pressure in the “diaphragm chamber”. Consequently, the balance of forces is further altered, which regulates the position of the diaphragm itself. This phenomenon ceases once the equilibrium position is reached, where the effect of the pressure in the ‘diaphragm chamber’, combined with the spring force, is equal to the effect of the supply pressure.
The valve operates according to three operating modes;
– Closed;
– Intermediate low-flow position;
– High-flow position.
The high-flow position may, in the worst-case scenario, correspond to the fully open valve position, but it can still be adjusted to limit the line capacity. The high- and low-flow positions are adjusted manually from the outside using adjustment screws.