What is a flow control valve and what is the difference between fixed and adjustable flow control?

What is a flow control valve and what is the difference between fixed and adjustable flow control?

• A. It filters contaminants from air
• B. It controls the rate of air flow; fixed has fixed orifice; adjustable allows setting the desired speed
• C. It stores compressed air
• D. It seals ports

Answer: (D)

Flow control valves regulate how quickly compressed air moves through a line, which directly determines how fast a pneumatic actuator will move. The fixed type has a built‑in, unchanging restriction, so the flow rate is set by the constant opening and the supply pressure. The adjustable type lets you dial in a desired speed by changing the size of the opening, usually with a needle valve, so you can tune how fast the actuator moves. Some designs may include a check valve to allow faster flow in the reverse direction, but the key idea is that flow control controls speed, not storage, filtration, or sealing. Filters remove contaminants, reservoirs store air, and seals close ports.

Flow control valves regulate how quickly compressed air moves through a line, which directly determines how fast a pneumatic actuator will move. The fixed type has a built‑in, unchanging restriction, so the flow rate is set by the constant opening and the supply pressure. The adjustable type lets you dial in a desired speed by changing the size of the opening, usually with a needle valve, so you can tune how fast the actuator moves. Some designs may include a check valve to allow faster flow in the reverse direction, but the key idea is that flow control controls speed, not storage, filtration, or sealing. Filters remove contaminants, reservoirs store air, and seals close ports.