How does the FPS type controlled check valve for unrestricted hydraulic fluid flow calculate the required control pressure based on the A1 side pressure and control coefficient?

The FPS type controlled check valve for unrestricted hydraulic fluid flow calculates the required control pressure (X) by multiplying the pressure on the A1 side (pA1) by the valve’s control coefficient (k). In formula form: X = k × pA1. This means the higher the A1-side pressure or the larger the control coefficient, the greater the control pressure needed to allow reverse flow (A1 → A). The valve still permits unrestricted forward flow (A → A1) above its standard opening pressure of 0.5 bar; reverse flow is only enabled when the computed control pressure X is applied.

How does the FPS type controlled check valve for unrestricted hydraulic fluid flow behave when the control signal “X” fails or is lost during reverse flow from A1 → A?

If the control signal “X” fails or is lost during reverse flow from A1 → A, the FPS type controlled check valve for unrestricted hydraulic fluid flow will remain closed to reverse flow. Reverse passage from A1 to A is only permitted when the required control pressure at X is present (calculated as control coefficient × pressure on A1). Without that control pressure, the valve blocks A1 → A, preventing unintended backflow and maintaining system safety. Note: forward flow A → A1 remains unrestricted (opens at ~0.5 bar) regardless of the X signal.

Valve check Controlled enabling free Flow rate liquids hydraulic, type FPS

All products, Directional control valves/

Additional information

Material	CS – steel (cast iron)

Valve FPS allows free Flow rate liquids hydraulic in one direction (A → A1) and opening flow liquids in direction opposite (A1 → A) under a condition supply pressure signal control “X”. standard pressure opening flow free (A → A1) 0.5 bar. required pressure signal control “X” for opening flow in direction opposite (A1 → A) determined is through product coefficient actuation and pressure po side A1. Material: steel galvanized (body), hardened steel (stem). sealing: NBR. Operating temperature: od -20°C up to +100°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-FPS-04	Check valve Controlled FPS 1/4" female, control 1/4" female	-	350	In stock	Enquiry
DC-FPS-06	Check valve Controlled FPS 3/8" female, control 1/4" female	-	350	In stock	Enquiry
DC-FPS-08	Check valve Controlled FPS 1/2" female, control 1/4" female	-	350	In stock	Enquiry
DC-FPS-12	Check valve Controlled FPS 3/4" female, control 1/4" female	-	300	In stock	Enquiry
DC-FPS-16	Check valve Controlled FPS 1" female, control 1/4" female	-	260	In stock	Enquiry

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Valve FPS allows free Flow rate liquids hydraulic in one direction (A → A1) and opening flow liquids in direction opposite (A1 → A) under a condition supply pressure signal control “X”. standard pressure opening flow free (A → A1) 0.5 bar. required pressure signal control “X” for opening flow in direction opposite (A1 → A) determined is through product coefficient actuation and pressure po side A1. Material: steel galvanized (body), hardened steel (stem). sealing: NBR. Operating temperature: od -20°C up to +100°C.