How do I adjust the opening pressure on the VM30 Pressure Relief Bypass Valve with BSP Thread and lock it securely?

How to adjust the opening pressure on the VM30 Pressure Relief Bypass Valve with BSP Thread and lock it securely: 1. Relieve system pressure and isolate the valve before any adjustment. 2. Insert an Allen key into the adjustment screw on the VM30 Pressure Relief Bypass Valve with BSP Thread. 3. Turn the Allen key clockwise to increase opening pressure or counterclockwise to decrease it. Make small, incremental turns and check system pressure after each adjustment until the desired setpoint is reached. 4. Once correct opening pressure is achieved, secure the setting by tightening the locking nut over the adjustment screw to prevent movement. 5. Re-pressurize the system and verify the valve opens at the set pressure. Repeat minor adjustments if necessary. Follow proper safety procedures and ensure the valve and fittings are compatible with your system pressure and temperature limits.

Can the VM30 Pressure Relief Bypass Valve with BSP Thread be used with fluids other than hydraulic oil, and are there any compatibility restrictions?

VM30 Pressure Relief Bypass Valve with BSP Thread is designed specifically for hydraulic systems and hydraulic oil. Its materials, seals and performance data reflect that intended use: - Seals: NBR (nitrile) seals are standard — suitable for mineral hydraulic oils but have limited chemical compatibility with many aggressive fluids (strong acids/alkalis, ketones, some esters, phosphate esters, aromatic hydrocarbons). - Materials: Body and components are galvanized steel and aluminium; these offer good corrosion resistance for hydraulic fluids but can be attacked by certain solvents, chlorinated hydrocarbons or highly corrosive media. - Temperatures and pressures: Rated for -20°C to +90°C and maximum working pressures up to 350 bar (1/4") and 260 bar (3/8" and 1/2"). Compatibility with other fluids must consider viscosity and temperature to ensure reliable operation and sealing. Compatibility restrictions and recommendations: - Safe to use with standard mineral-based hydraulic oils and many hydraulic fluids formulated to be NBR-compatible. - Avoid or verify before use with aggressive chemicals, solvents, synthetic esters not specified as NBR-compatible, water glycol fluids at extremes, or any media that may swell/degrade NBR or corrode aluminium/galvanized steel. - If you plan to use non-hydraulic oils or special fluids, consult the fluid manufacturer for NBR and metal compatibility and perform validation testing (sealing, corrosion, pressure/temperature behavior) or request valve variants with compatible seals/materials. In short: VM30 Pressure Relief Bypass Valve with BSP Thread is intended for hydraulic oil; other fluids may be usable only after confirming NBR and metal compatibility and validating operating conditions.

VM30 Pressure Relief Bypass Valve with BSP Thread

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Additional information

Material	AL – aluminum

The VM30 relief valve is designed to ensure reliable protection of hydraulic systems by limiting maximum oil pressure and maintaining safe operating conditions. It enables unrestricted fluid flow between P connections, while automatically opening the T channel to direct excess oil back to the tank once the preset pressure threshold is exceeded. The opening pressure can be precisely adjusted with an Allen key via a screw mechanism, secured with a locking nut for stability. Featuring convenient mounting holes, the valve is built with robust materials: galvanized steel for the 1/4″ body, aluminum for the 3/8″ and 1/2″ versions, and galvanized steel for the valve components. Durable NBR seals guarantee leak-free performance, while the unit withstands maximum working pressures of 350 bar (1/4″) and 260 bar (3/8″ and 1/2″). Engineered for demanding environments, the VM30 operates reliably within a temperature range of -20°C to +90°C, offering a compact, efficient, and long-lasting solution for hydraulic pressure control.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-VM30-00-04	VM30 relief valve with 1/4" BSP thread, 35 l/min, 0-50 bar	-	350	In stock	Enquiry
DC-VM30-00-06	VM30 relief valve with 3/8" BSP thread, 35 l/min, 0-50 bar	-	260	In stock	Enquiry
DC-VM30-00-08	VM30 relief valve with 1/2" BSP thread, 35 l/min, 0-50 bar	-	260	In stock	Enquiry
DC-VM30-05-04	VM30 relief valve with 1/4" BSP thread, 35 l/min, 50-200 bar	-	350	In stock	Enquiry
DC-VM30-05-06	VM30 relief valve with 3/8" BSP thread, 35 l/min, 50-200 bar	-	260	In stock	Enquiry
DC-VM30-05-08	VM30 relief valve with 1/2" BSP thread, 35 l/min, 50-200 bar	-	260	In stock	Enquiry
DC-VM30-20-04	VM30 relief valve with 1/4" BSP thread, 35 l/min, 200-350 bar	-	350	In stock	Enquiry
DC-VM30-20-06	VM30 relief valve with 3/8" BSP thread, 35 l/min, 200-350 bar	-	260	In stock	Enquiry
DC-VM30-20-08	VM30 relief valve with 1/2" BSP thread, 35 l/min, 200-350 bar	-	260	In stock	Enquiry

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The VM30 relief valve is designed to ensure reliable protection of hydraulic systems by limiting maximum oil pressure and maintaining safe operating conditions. It enables unrestricted fluid flow between P connections, while automatically opening the T channel to direct excess oil back to the tank once the preset pressure threshold is exceeded. The opening pressure can be precisely adjusted with an Allen key via a screw mechanism, secured with a locking nut for stability. Featuring convenient mounting holes, the valve is built with robust materials: galvanized steel for the 1/4″ body, aluminum for the 3/8″ and 1/2″ versions, and galvanized steel for the valve components. Durable NBR seals guarantee leak-free performance, while the unit withstands maximum working pressures of 350 bar (1/4″) and 260 bar (3/8″ and 1/2″). Engineered for demanding environments, the VM30 operates reliably within a temperature range of -20°C to +90°C, offering a compact, efficient, and long-lasting solution for hydraulic pressure control.