Does the Hydraulic Pilot-Operated Check Valve for Double-Acting Cylinders, BSP, FPDL prevent unintended actuator movement during both extension and retraction?

Yes. The Hydraulic Pilot-Operated Check Valve for Double-Acting Cylinders, BSP, FPDL prevents unintended actuator movement during both extension and retraction. Its controlled check design locks the double-acting actuator in both flow paths—V1 → C1 (with C2 → V2 simultaneously) and V2 → C2 (with C1 → V1 simultaneously)—so the piston rod cannot move unless the pilot pressure opens the valve. Built from durable materials (galvanized steel or aluminum body, hardened steel stem) with NBR seals, a 3 bar opening pressure and -20°C to +100°C operating range, it provides reliable holding and safe operation across typical industrial conditions.

How does the Hydraulic Pilot-Operated Check Valve for Double-Acting Cylinders, BSP, FPDL handle backflow and pressure reversals to maintain actuator stability?

The Hydraulic Pilot-Operated Check Valve for Double-Acting Cylinders, BSP, FPDL prevents backflow and manages pressure reversals to keep the actuator stable by mechanically blocking unintended reverse flow and using a pilot mechanism to allow controlled movement. In normal operation it permits designated flow paths (V1 → C1 with C2 → V2, or V2 → C2 with C1 → V1) while the check function closes when reverse pressure appears, locking the cylinder and preventing sudden or uncontrolled motion. When pilot pressure is applied, the pilot opens the check to allow deliberate rod extension or retraction, ensuring movement only under command. Constructed from robust materials (galvanized steel or aluminum body, hardened steel stem) with NBR seals and a 3 bar opening pressure, the valve maintains tightness and reliable sealing under pressure transients and temperature extremes (-20°C to +100°C). Two mounting holes ensure secure installation, minimizing mechanical disturbance that could compromise stability. Overall, the FPDL’s combination of positive check sealing and pilot-controlled opening provides dependable protection against backflow and pressure reversals, preserving actuator position and safety.

Hydraulic Pilot-Operated Check Valve for Double-Acting Cylinders, BSP, FPDL

All products, Directional control valves/

Additional information

Material	CS – steel (cast iron)

The FPDL type controlled check valve is a reliable safety component designed for hydraulic systems, effectively preventing unintended movements of double-acting actuators during both piston rod extension and retraction. It ensures secure operation with permissible flow directions V1 → C1 (simultaneously C2 → V2) and V2 → C2 (simultaneously C1 → V1), providing precise control and dependable performance. The valve body is manufactured from high-quality galvanized steel in sizes 1/4″ and 3/8″, or lightweight aluminum in 1/2″ and 3/4″, while the stem is made of hardened steel for maximum durability. Equipped with NBR seals, it guarantees excellent resistance to wear and hydraulic fluids, maintaining tightness even under demanding conditions. With an opening pressure of 3 bar and an operating temperature range from -20°C to +100°C, the valve is suitable for a wide variety of industrial applications. Two mounting holes, clearly visible in the design, allow for quick and secure installation, making the FPDL valve a practical and efficient solution for enhancing the safety and reliability of hydraulic systems.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-FPDL-04	FPDL GW 1/4" controlled check valve	-	350	In stock	Enquiry
DC-FPDL-06	FPDL GW 3/8" controlled check valve	-	350	In stock	Enquiry
DC-FPDL-08	FPDL GW 1/2" controlled check valve	-	260	In stock	Enquiry
DC-FPDL-12	FPDL GW 3/4" controlled check valve	-	260	In stock	Enquiry

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The FPDL type controlled check valve is a reliable safety component designed for hydraulic systems, effectively preventing unintended movements of double-acting actuators during both piston rod extension and retraction. It ensures secure operation with permissible flow directions V1 → C1 (simultaneously C2 → V2) and V2 → C2 (simultaneously C1 → V1), providing precise control and dependable performance. The valve body is manufactured from high-quality galvanized steel in sizes 1/4″ and 3/8″, or lightweight aluminum in 1/2″ and 3/4″, while the stem is made of hardened steel for maximum durability. Equipped with NBR seals, it guarantees excellent resistance to wear and hydraulic fluids, maintaining tightness even under demanding conditions. With an opening pressure of 3 bar and an operating temperature range from -20°C to +100°C, the valve is suitable for a wide variety of industrial applications. Two mounting holes, clearly visible in the design, allow for quick and secure installation, making the FPDL valve a practical and efficient solution for enhancing the safety and reliability of hydraulic systems.