What is the standard opening pressure and available alternatives for the Throttling and check valve for hydraulic systems, type FPMU?

Throttling and check valve for hydraulic systems, type FPMU . standard opening pressure is 0.5 bar. Alternative opening pressures available: 2.5 bar, 5 bar, and 10 bar. Additional key data: permits free flow A â A1 and throttled flow A1 â A (regulated by a rotating ring). Body: galvanized steel; stem: hardened steel; sealing: NBR. Operating temperature range: â20 Â°C to +90 Â°C.

Can the Throttling and check valve for hydraulic systems, type FPMU be used with fluids other than hydraulic oil?

Throttling and check valve for hydraulic systems, type FPMU is designed primarily for use with hydraulic oils. Its materials and seals limit suitability for other fluids: - Sealing material: NBR (nitrile rubber). compatible with mineral hydraulic oils, petroleum-based fluids, and some glycol-based fluids. NBR is not suitable for many synthetic fluids (e.g., phosphate esters), ketones, strong solvents, ozone- or fuel-rich environments, or some water-glycol mixtures at high temperatures or prolonged exposure. - Metals: galvanized steel body and hardened steel stemâgenerally compatible with many non-corrosive fluids but can corrode with aggressive or acidic fluids, seawater, or fluids containing halogenated hydrocarbons unless corrosion inhibitors are present. - Temperature range: â20Â°C to +90Â°C. fluids requiring operation outside this range may degrade seals or change viscosity beyond acceptable limits for proper throttling and sealing. - Pressure/opening specs: standard cracking pressure 0.5 bar (others 2.5, 5, 10 bar) and flow direction A â A1 free, A1 â A throttled. mechanical function depends on fluid viscosity; very low-viscosity fluids may leak or not throttle predictably, very high-viscosity fluids may cause excessive pressure drop or sluggish response. Conclusion: Throttling and check valve for hydraulic systems, type FPMU can be used with fluids other than hydraulic oil only if those fluids are chemically compatible with NBR and steel, operate within â20Â°C to +90Â°C, and have similar viscosity and lubricity to hydraulic oil. For aggressive, high-temperature, water-based, or synthetic fluids incompatible with NBR or galvanised steel, select a valve with appropriate seal material (e.g., Viton, EPDM, PTFE) and corrosion-resistant construction. For a definitive answer, consult the fluid manufacturerâs compatibility data and the valve supplier.

Throttling and check valve for hydraulic systems, type FPMU

Q: How does the rotating ring on the Throttling and check valve for hydraulic systems, type FPMU adjust the flow rate in the throttled direction?

The Throttling and check valve for hydraulic systems, type FPMU adjusts the flow rate in the throttled direction (A1 â A) by means of an adjustable rotating ring that changes the effective flow aperture. In free direction (A â A1) the valve opens fully at the set cracking pressure (standard 0.5 bar; options 2.5, 5, 10 bar) allowing unrestricted flow. In the reverse, throttled direction the rotating ring is turned to vary the gap around the valve stem, increasing or decreasing flow resistance and thus controlling flow rate. The body is galvanized steel, stem hardened steel, seals NBR; operating range â20 Â°C to +90 Â°C.

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Additional information

Material	CS – steel (cast iron)

FPMU throttling check valve used in hydraulic systems as a component to allow free flow in one direction. The flow throttled in the opposite direction is regulated by a rotating ring. Standard opening pressure 0.5 bar (also available in 2.5, 5, and 10 bar). Permissible flow direction: A → A1 (free), A1 → A (throttled). Material: galvanized steel (body), hardened steel (stem). Sealing: NBR. Operating temperature: from -20°C to +90°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-FPMU-04	FPMU throttling check valve GW 1/4	-	350	In stock	Enquiry
DC-FPMU-06	FPMU throttling check valve GW 3/8"	-	350	In stock	Enquiry
DC-FPMU-08	FPMU throttling check valve GW 1/2	-	310	In stock	Enquiry
DC-FPMU-12	FPMU throttling check valve GW 3/4	-	280	In stock	Enquiry
DC-FPMU-16	FPMU throttling check valve GW 1	-	250	In stock	Enquiry

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FPMU throttling check valve used in hydraulic systems as a component to allow free flow in one direction. The flow throttled in the opposite direction is regulated by a rotating ring. Standard opening pressure 0.5 bar (also available in 2.5, 5, and 10 bar). Permissible flow direction: A → A1 (free), A1 → A (throttled). Material: galvanized steel (body), hardened steel (stem). Sealing: NBR. Operating temperature: from -20°C to +90°C.