What is the correct procedure to adjust the opening pressure on the Pressure limiting bypass valve with GW BSP, type VMPP, and how do you lock the setting?

Pressure limiting bypass valve with GW BSP, type VMPP . correct adjustment and locking procedure: 1. Prepare system: relieve hydraulic pressure and isolate the valve from the pump line. Ensure tank side is open and safe to receive fluid. 2. Access adjustment: locate the Allen-head adjustment screw on the valve body. 3. Initial setting: insert the proper size Allen key. Turn clockwise to increase opening pressure or counterclockwise to decrease it. Make adjustments slowly while monitoring system pressure via the valveâs GW 1/4" BSP pressure gauge connection (install a gauge if not fitted). 4. Verify under load: re-pressurize the system gradually and observe the gauge. Apply typical operating load cycles and confirm the valve opens at the desired pressure (up to the 400 bar maximum rating). 5. Finalize and lock: when the target opening pressure is reached, secure the setting by tightening the locking nut against the adjustment screw to prevent movement. Re-check pressure after locking to ensure setting did not shift. 6. Restore operation: remove isolation, check for leaks (seals are NBR), and confirm stable operation across the temperature range (-20Â°C to +90Â°C). Safety notes: perform adjustments only with appropriate PPE, and do not exceed the valveâs maximum working pressure.

How often should the Pressure limiting bypass valve with GW BSP, type VMPP be inspected and serviced to ensure reliable pressure relief?

Pressure limiting bypass valve with GW BSP, type VMPP should be inspected and serviced regularly to ensure reliable pressure relief. Recommended schedule: - Visual inspection: monthly - check for external leaks, corrosion of galvanized steel, damaged mounting, and condition of NBR seals. - Functional check: every 3 months - verify free flow between P ports, confirm relief opens at set pressure using the pressure gauge connection (GW 1/4" BSP), and ensure adjustment screw and locking nut operate correctly. - Full service: annually (or every 1,000 operating hours, whichever comes first) - disassemble, clean, replace NBR seals if any wear, inspect internal parts for wear/corrosion, verify opening pressure and recalibrate with Allen key, tighten locking nut. Perform immediate inspection after any abnormal pressure event or if operating near limits (close to 400 bar) or outside -20Â°C to +90Â°C.

Can the Pressure limiting bypass valve with GW BSP, type VMPP be fitted with a different gauge size than GW 1/4" BSP?

Pressure limiting bypass valve with GW BSP, type VMPP is supplied with a pressure gauge connection sized GW 1/4" BSP. Technically, fitting a different gauge size is possible, but requires using a suitable adapter or replacing the gauge with one that has a matching BSP thread. Before changing size you must ensure: - Thread compatibility: adapters must convert from 1/4" BSP to the desired thread type/size (BSPP/BSPT) and maintain proper sealing. - Pressure rating: any adapter and replacement gauge must be rated for the valveâs maximum working pressure (400 bar). - Seal material and temperature: seals (NBR specified for the valve) in the adapter/gauge must be compatible with system fluid and the operating range (-20Â°C to +90Â°C). - Mechanical fit and clearance: adapters/gauges must not interfere with mounting holes or cause undue stress on the valve body. - Leak tightness: use correct sealing method (PTFE tape, suitable sealant, or forming washer) appropriate for BSP threads and high pressure. If you cannot source an appropriate high-pressure BSP adapter or replacement gauge, consult the valve manufacturer or a qualified hydraulic specialist to avoid safety risks. In summary: fitting a different gauge size is feasible via a properly rated adapter or a replacement gauge with compatible threads, provided thread type, pressure rating, sealing material and mechanical fit are all respected.

Pressure limiting bypass valve with GW BSP, type VMPP

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Additional information

Material	CS – steel (cast iron)

VMPP relief valve limiting the maximum oil pressure in hydraulic systems. It allows free flow of fluid between the P connections. When the pressure exceeds the set value, the T path opens and excess oil drains to the tank. The opening pressure value is set using a screw (adjustment with an Allen key, locked with a locking nut). The valve is equipped with a pressure gauge connection (GW 1/4″ BSP) and mounting holes. Body material: galvanized steel. Valve material: galvanized steel. Sealing: NBR. Maximum working pressure: 400 bar. Operating temperature: from -20°C to +90°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Price	Quantity	Actions	Catalogue
DC-VMPP-20-12	VMPP relief valve with 3/4" BSP thread, 120 l/min, 20-200 bar	-	400	In stock	0 zł		Enquiry
DC-VMPP-50-12	VMPP relief valve with 3/4" BSP thread, 120 l/min, 50-400 bar	-	400	In stock	0 zł		Enquiry

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VMPP relief valve limiting the maximum oil pressure in hydraulic systems. It allows free flow of fluid between the P connections. When the pressure exceeds the set value, the T path opens and excess oil drains to the tank. The opening pressure value is set using a screw (adjustment with an Allen key, locked with a locking nut). The valve is equipped with a pressure gauge connection (GW 1/4″ BSP) and mounting holes. Body material: galvanized steel. Valve material: galvanized steel. Sealing: NBR. Maximum working pressure: 400 bar. Operating temperature: from -20°C to +90°C.