Fixed flow control valves achieve fluid flow control by changing the size of the throttle nozzle to change the throttle area of the liquid. The throttle nozzle is made of ceramic or cemented carbide, which has wear resistance and erosion resistance, and its replacement adopts special tools, which is quick and convenient. The valve body and bonnet are connected by non, which is easy to disassemble.
Orifice plate throttle valves use a rotary fork to actuate the seat assembly, which generally only needs to rotate the fork 90° or 180° to open and close the valve. The two ends of the fork are preloaded and positioned, which improves the rigidity of the fork and reduces its vibration, so that the operation of the fork is smooth and safe. With hydraulic, pneumatic and electric drive devices, orifice plate throttle valve can achieve more accurate adjustment, so orifice plate type throttle valve is widely used.