The flow rate control valve has an evaporator (1) considered as a choked passage and a constant differential pressure valve.

The pressure difference at the rear ports (35, 36) is divided by the pressure difference of the forward ports (22, 25).

When there is no flow to the load there is no differential pressure across the piston (111) and the bypass valve (128) is open.

The response time and sensitivity of the system are adjusted by a flow control valve (68) in the charging circuit, and by increasing or decreasing the pressure differential between the charging pressure and the set point pressure.

The high-pressure tank (1) comprises the valve assembly (10) integrally having a cutoff valve (11) and the pressure regulating valve (12).

The pressure controlled valve can be a control valve.

Pressure control valve (Figure 16

Application to pressure differential sensors, and to devices for measuring displacements.

The invention also includes the valve member and valve seal assembly used in a pressure limiting valve of the invention.

The invention also relates to a valve arrangement comprising such a pressure controlling valve.

Each valve (18,14,15) has an associated pressure compensating valve (48) which regulates the pressure differential across a metering orifice of each valve to a predefined level, usually the pump's margin pressure.

A fluid pressure control apparatus having a main valve and a pilot valve for moving the main valve to a shutoff position as a function of the fluid pressure in a supply fluid.

A pressure- valve (40) accommodates pressure fluctuations in the system.

By monitoring the pressure of the fluid introduced into the valve it is possible to prevent the applied pressure from exceeding the safe working pressure of the valve.

With differing control modes, the solenoid valve can be operated either as an on-off valve, or as a pressure-relief valve.