Flow control valves are specialised fittings used in sophisticated hydraulic and pneumatic systems. These valves include simple tool orifices, along with a sophisticated set of hydraulic valves that are expertly designed to adjust to the differences in system temperature and pressure.
Flow Control Valves
The flow control valve fittings are used to reduce the actual flow rate in a definite section of a pneumatic circuit. This reduces the actuator speed of the system. While a needle valve controls flow in two directions, a flow control valve fitting directs system flow in only one direction. This way, free flow of the gas or liquid is allowed in the opposite direction.
The threaded stem of the valve ensures gradual and easy adjustment of the quantity of controlled flow allowed to pass through the valve. There are two types of flow control valves used in pneumatic circuits. The selection and installation of these two types of flow control valves has a significantly impact on an actuator’s actual performance.
- Meter Out Valve – It is a common type of control valve used to regulate the exhaust flow released by the actuator.
- Meter In Valve – Also called the Reverse flow control valve, it restricts flow to the actuator itself.
One of the most important factors to consider when choosing a flow control valve for a specific system application is the flow control requirement. The actual speed of the actuator is completely dependent on the rate of air supplied to the input and the air flow calculated at the exhaust output.
Use In Pneumatic Systems
A flow control valve in a pneumatic system provides directional control of flow. It is responsible for directing the energy transfer to the right place within the system, at the proper time. A valve that controls and directs flow ensures that the high-energy input stream is directed to the actuator inlet, which in turn provides a suitable path for the low-energy system oil.
The system has a critical need for the flow stream to reach the right place at the right time. The actual control of flow and pressure to direct energy transfer within the system is of secondary importance. The secondary function of the directional valves and fittings is to ensure the proper timing of the cyclic events.
As valves offer multiple ports and entryways, they are used in pneumatic and hydraulic systems to control, direct, allow, and inhibit the flow of air pressurised within the system. The resultant air pressure powers up and energises the system accordingly.
The numerous ports on the valves help create the required flow patterns, enabling efficient system operation and fast actuator speeds to power up the device. For more information, please visit us at sealexcel.com
