The operating principle of angle seat valves
Angle seat valves are used to regulate the flow of liquids, gases, steam, vacuum and even corrosive fluids. They can operate in high-temperature and high-viscosity media, and even at zero pressure. The robust and durable design makes angle seat valves a popular choice for harsh applications, and their service life is relatively long.

Angle seat valves use pneumatic technology to drive the control piston to lift the seal from the valve seat. They feature high flow rates and a long economic service life. Due to the angle of the valve seat, the flow reaches its maximum when the valve is fully open.

Normally closed (NC) valves typically close the valve under non-pressurized conditions and use a spring to return the valve to its resting position. Normally open (NO) valves remain open at all times unless they are closed by air pressure. An NO valve can be obtained if the spring is placed on the other side of the piston actuator. Double-acting valves can be used to handle bidirectional flow. These valves have no springs and rely on the gas supply to determine the valve position. These configurations affect the rated pressure of the valve. Flowing above and below the valve (causing the valve to open) reduces water hammer effects but usually reduces the maximum working pressure of the valve by 50%. However, installing a strong reset spring will help increase the working pressure, but a larger actuator is needed to overcome the increased spring strength. Flowing through the valve seat (causing the valve to close).

Generally, three-way solenoid valves are used to operate CNC or angle seat valves. These angle valves have one connection port to the piston chamber. The solenoid valve control chamber is pressurized or vented. The described double-acting angle valve has two connection pieces and cannot be controlled by a three-way valve. They can be controlled by a five-way solenoid valve, pressurizing one port and venting the other port, and vice versa.