What is the adjustable pressure range and locking method for the Pressure Limiting Bypass Valve with GW BSP, Model VM80?

Pressure Limiting Bypass Valve with GW BSP, Model VM80 — the opening pressure is adjustable via a screw operated with an Allen key and can be securely locked using a counter nut. The valve’s maximum operating pressure is 260 bar; the adjustable pressure range is therefore up to 260 bar (preset setpoint adjustable from low values up to the 260 bar limit), with the locking method provided by the counter nut.

How does the Pressure Limiting Bypass Valve with GW BSP, Model VM80 handle fluid compatibility and what seals are used to prevent leakage at high temperatures?

The Pressure Limiting Bypass Valve with GW BSP, Model VM80 handles fluid compatibility and high‑temperature sealing as follows: - Fluid compatibility: The VM80 is intended for hydraulic oil systems and is constructed with materials suited to standard mineral-based hydraulic fluids. Its aluminum body and galvanized steel internals provide corrosion resistance and mechanical durability compatible with typical hydraulic oils used up to the stated operating limits. - Seals and high‑temperature leakage prevention: The valve uses high-quality NBR (nitrile rubber) seals. NBR provides good resistance to wear, oil swelling and leakage for mineral oils across the VM80’s specified temperature range. The VM80 is rated for continuous operation from -20°C to +90°C; within this range the NBR seals maintain sealing integrity to prevent leakage under pressures up to 260 bar. The adjustable screw and counter nut locking help maintain set pressure without causing seal distortion that could lead to leaks. Note: For compatibility with non‑standard fluids (e.g., phosphate esters, synthetic fluids, or aggressive additives) or prolonged use above +90°C, consult the manufacturer for recommended seal materials or alternative configurations.

Pressure Limiting Bypass Valve with GW BSP, Model VM80

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Additional information

Material	AL – aluminum

The VM80 relief valve is a reliable solution designed to protect hydraulic systems by effectively limiting maximum oil pressure. It ensures smooth and unrestricted fluid flow between the P connections, while automatically opening the T path to direct excess oil back to the tank once the preset pressure threshold is exceeded. The opening pressure can be precisely adjusted with a screw using an Allen key and securely locked with a counter nut, allowing for easy customization to system requirements. Built with a durable aluminum body and robust galvanized steel internal components, the valve guarantees long-lasting performance even under demanding conditions. High-quality NBR sealing ensures excellent resistance to wear and leakage, maintaining system efficiency and safety. With a maximum operating pressure of 260 bar and a wide temperature range from -20°C to +90°C, the VM80 is engineered for versatility and reliability across various industrial applications. Convenient mounting holes further simplify installation, making this valve a practical and efficient choice for modern hydraulic systems.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-VM80-00-08	VM80 relief valve with 1/2" BSP thread, 80 l/min, 5-50 bar	-	260	In stock	Enquiry
DC-VM80-00-12	VM80 relief valve with 3/4" BSP thread, 80 l/min, 5-50 bar	-	260	In stock	Enquiry
DC-VM80-10-08	VM80 relief valve with 1/2" BSP thread, 80 l/min, 30-260 bar	-	260	In stock	Enquiry
DC-VM80-10-12	VM80 relief valve with 3/4" BSP thread, 80 l/min, 30-260 bar	-	260	In stock	Enquiry

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The VM80 relief valve is a reliable solution designed to protect hydraulic systems by effectively limiting maximum oil pressure. It ensures smooth and unrestricted fluid flow between the P connections, while automatically opening the T path to direct excess oil back to the tank once the preset pressure threshold is exceeded. The opening pressure can be precisely adjusted with a screw using an Allen key and securely locked with a counter nut, allowing for easy customization to system requirements. Built with a durable aluminum body and robust galvanized steel internal components, the valve guarantees long-lasting performance even under demanding conditions. High-quality NBR sealing ensures excellent resistance to wear and leakage, maintaining system efficiency and safety. With a maximum operating pressure of 260 bar and a wide temperature range from -20°C to +90°C, the VM80 is engineered for versatility and reliability across various industrial applications. Convenient mounting holes further simplify installation, making this valve a practical and efficient choice for modern hydraulic systems.