Does the FPD Controlled Check Valve for Hydraulic Systems prevent unintended actuator movement during piston extension or retraction?

Yes. The FPD Controlled Check Valve for Hydraulic Systems is specifically designed to prevent unintended actuator movement during piston rod extension or retraction. By allowing controlled flow only in the paired directions (V1 → C1 with simultaneous C2 → V2, and V2 → C2 with simultaneous C1 → V1), it provides hydraulic locking of double-acting actuators, ensuring secure positioning. Its robust galvanized steel body, hardened steel piston, and NBR seals deliver reliable tightness and durability under load and temperature extremes (-20°C to +100°C). With opening pressures of 3 bar (and 0.5 bar for 3/4" thread), the valve engages predictably to maintain safety and prevent unwanted motion.

Can the FPD Controlled Check Valve for Hydraulic Systems maintain a hydraulic lock under fluctuating inlet pressures and dynamic loading conditions?

Yes. The FPD Controlled Check Valve for Hydraulic Systems is designed to maintain a hydraulic lock even under fluctuating inlet pressures and dynamic loading. Key features that enable reliable locking: - Bidirectional control: permits flow V1→C1 with simultaneous C2→V2 and V2→C2 with simultaneous C1→V1, ensuring secure control of double‑acting actuators during extension and retraction. - Robust construction: galvanized steel body resists corrosion and mechanical damage; hardened steel piston withstands high dynamic loads. - High tightness: NBR seals provide effective sealing to prevent internal leakage that would compromise a lock. - Low and predictable opening pressure: standard 3 bar (0.5 bar for 3/4" thread) ensures the valve only opens when intended, preventing unintended actuator movement under pressure fluctuations. - Wide temperature range (−20°C to +100°C): preserves material and seal performance across typical operating conditions, maintaining lock integrity. Together, these characteristics provide dependable hydraulic locking under variable inlet pressures and dynamic loads, though final performance depends on correct sizing, system contamination control, and compatibility with specific application conditions.

FPD Controlled Check Valve for Hydraulic Systems

All products, Directional control valves/

Additional information

Material	CS – steel (cast iron)

The FPD controlled check valve, also known as a hydraulic lock, is designed to ensure maximum safety and reliability in hydraulic systems by preventing unintended movements of double-acting actuators during piston rod extension or retraction. Engineered for precise control, it allows flow in the directions V1 → C1 with simultaneous C2 → V2, as well as V2 → C2 with simultaneous C1 → V1, guaranteeing smooth and secure operation. The robust body is manufactured from galvanized steel for superior corrosion resistance, while the piston is made of hardened steel to withstand high mechanical loads and ensure long service life. Equipped with NBR seals, the valve provides excellent tightness and durability under demanding conditions. With an opening pressure of 3 bar, and just 0.5 bar for the 3/4″ thread size, it offers efficient performance tailored to system requirements. Designed to operate reliably within a wide temperature range from -20°C to +100°C, the FPD valve is an ideal choice for applications requiring dependable hydraulic locking, enhanced safety, and long-term operational stability.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-FPD-04	FPD GW 1/4" controlled check valve	-	350	In stock	Enquiry
DC-FPD-06	FPD GW 3/8" controlled check valve	-	350	In stock	Enquiry
DC-FPD-06-30L	FPD GW 3/8" controlled check valve, compact	-	350	In stock	Enquiry
DC-FPD-08	FPD GW 1/2 controlled check valve	-	350	In stock	Enquiry
DC-FPD-12	FPD GW 3/4" controlled check valve	-	210	In stock	Enquiry

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The FPD controlled check valve, also known as a hydraulic lock, is designed to ensure maximum safety and reliability in hydraulic systems by preventing unintended movements of double-acting actuators during piston rod extension or retraction. Engineered for precise control, it allows flow in the directions V1 → C1 with simultaneous C2 → V2, as well as V2 → C2 with simultaneous C1 → V1, guaranteeing smooth and secure operation. The robust body is manufactured from galvanized steel for superior corrosion resistance, while the piston is made of hardened steel to withstand high mechanical loads and ensure long service life. Equipped with NBR seals, the valve provides excellent tightness and durability under demanding conditions. With an opening pressure of 3 bar, and just 0.5 bar for the 3/4″ thread size, it offers efficient performance tailored to system requirements. Designed to operate reliably within a wide temperature range from -20°C to +100°C, the FPD valve is an ideal choice for applications requiring dependable hydraulic locking, enhanced safety, and long-term operational stability.