External cracking pressure adjustable relief valve "RM1 series"

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Relief Valve RM1 Series

last updated：Nov 17, 2025

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This is a relief valve that allows for arbitrary adjustment of cracking pressure from the outside! It is compatible with liquids and is ideal for pressure control applications in pumps.

It is a small pressure control valve that releases pressure from the primary side to the secondary side when the pressure inside the piping exceeds the set pressure. By installing an optional manual release mechanism, it is also possible to manually force a release. ■ The special packing suppresses valve oscillation. ■ The stainless steel body uses SCS14 (equivalent to SUS316), which has excellent corrosion resistance. ■ The cracking pressure can be adjusted arbitrarily from the outside (pressure adjusted at the time of factory shipment). ■ Suitable for liquids, inline type, and designed for high flow rates (compared to our products). *For more details, please refer to the PDF document or feel free to contact us.

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basic information

【Specifications】 ■Fluid used: Gas or liquid that does not corrode the wetted parts ■Connection diameter: Inlet R1/4 × Outlet Rc1/4 ■Pressure resistance: 3.0 MPa ■Cracking pressure: 50–1500 kPa ■Operating temperature range: 0–90℃ (FKM) ■Operating environment range: 0–60℃ ■Body material: Brass / SCS14 (equivalent to SUS316) ■Seal material: Fluoro rubber FKM (standard) 【Notes】 ■Manual release mechanism (pull ring or toggle lever) is available as an option. ■If you require other materials, please inquire. ■For other fluids, please select the RM2 series. ■If you are considering an oil-free specification, please inquire. *For more details, please refer to the PDF document or feel free to contact us.