Can the Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL withstand continuous operation at +100Â°C without seal degradation?

Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL Format: According to the provided specification, the valveâs sealing material is NBR (nitrile rubber) and the listed operating temperature range is -20Â°C to +100Â°C. NBR can operate up to +100Â°C, but at that upper limit continuous exposure tends to accelerate ageing (hardening, loss of elasticity, swelling or cracking) compared with moderate temperatures. Conclusion: Running continuously at +100Â°C is at the maximum allowable limit and may shorten seal life and increase risk of degradation over time. For reliable long-term continuous operation at or near +100Â°C, consider verifying with the manufacturer about expected service life, using a higher-temperature seal material (e.g., FKM/Viton), or implementing periodic inspection/replacement intervals.

Does the Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL require special lubrication for reliable operation at -20Â°C?

Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL: According to the provided description the valve uses NBR seals and an operating temperature range from â20Â°C to +100Â°C. NBR can become stiffer at low temperatures, but no special lubrication is specified. For reliable operation at â20Â°C consider using hydraulic fluid with appropriate low-temperature viscosity and ensure system components are compatible; periodic inspection and, if necessary, light machine oil on exposed moving parts (not inside sealing surfaces) can help. If extreme cold cycling or low-temp performance is critical, consult the manufacturer about using low-temperature-compatible seals (e.g. FKM/EPDM) or specified lubricants.

Is the Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL compatible with mineral and synthetic hydraulic fluids?

Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL Format uses NBR (nitrile) seals and materials (galvanized steel/aluminum body, hardened steel stem). NBR seals are generally compatible with a wide range of mineral hydraulic oils and many synthetic hydraulic fluids, but compatibility depends on the specific synthetic formulation (e.g., phosphate esters, some PAOs, ester-based fluids can affect NBR differently). Operating temperature range â20 Â°C to +100 Â°C is typical for mineral oils and many synthetics within normal service conditions. Conclusion: In most cases the Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL Format is compatible with mineral hydraulic fluids and with many common synthetic hydraulic fluids, but you should confirm compatibility of the specific synthetic fluid with NBR seals (or request alternative seal materials) before use in aggressive or unusual fluids.

Hydraulic pressure-controlled check valve for double-acting cylinders, BSP thread, FPDL

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Additional information

Material	CS – steel (cast iron)

FPDL type controlled check valve used in hydraulic systems as a safety element against unintended movement of double-acting actuators (retraction / extension of the piston rod). Permissible flow directions: V1 → C1 (and simultaneously C2 → V2), V2 → C2 (and simultaneously C1 → V1). The valve is equipped with 2 mounting holes visible in the photo. Material: body – galvanized steel (1/4″, 3/8″), aluminum (1/2″, 3/4″); stem – hardened steel. Sealing: NBR. Opening pressure: 3 bar. Operating temperature: from -20°C to +100°C.

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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FPDL type controlled check valve used in hydraulic systems as a safety element against unintended movement of double-acting actuators (retraction / extension of the piston rod). Permissible flow directions: V1 → C1 (and simultaneously C2 → V2), V2 → C2 (and simultaneously C1 → V1). The valve is equipped with 2 mounting holes visible in the photo. Material: body – galvanized steel (1/4″, 3/8″), aluminum (1/2″, 3/4″); stem – hardened steel. Sealing: NBR. Opening pressure: 3 bar. Operating temperature: from -20°C to +100°C.