Which valve is used to hold pressure while the work cylinder is withdrawn?

Which valve is used to hold pressure while the work cylinder is withdrawn?

• A. Sequence valve
• B. Pressure relief valve
• C. Pressure switch
• D. Flow control valve

Answer: (A)

In systems where actions must occur in a specific order, you need a way to hold pressure on one part of the circuit while another action completes. A sequence valve does exactly that: it traps pressure in the line feeding the work cylinder and keeps it from moving until the valve is set to a certain pressure, which lets the withdrawal happen without the cylinder creeping or dropping due to load. Once the condition is met, the valve opens and the sequence can proceed. The pressure relief valve protects the system by venting excess pressure, the pressure switch acts as a sensor that starts or stops circuits at a set pressure, and the flow control valve manages speed but doesn’t lock pressure to hold a cylinder in place. So, the valve that holds pressure while the work cylinder is withdrawn is the sequence valve.

In systems where actions must occur in a specific order, you need a way to hold pressure on one part of the circuit while another action completes. A sequence valve does exactly that: it traps pressure in the line feeding the work cylinder and keeps it from moving until the valve is set to a certain pressure, which lets the withdrawal happen without the cylinder creeping or dropping due to load. Once the condition is met, the valve opens and the sequence can proceed. The pressure relief valve protects the system by venting excess pressure, the pressure switch acts as a sensor that starts or stops circuits at a set pressure, and the flow control valve manages speed but doesn’t lock pressure to hold a cylinder in place. So, the valve that holds pressure while the work cylinder is withdrawn is the sequence valve.