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Relief Valve. Pre-set at 1,500 to 1,700 psi. Non-adjustable. 1/8" male NPTF inlet.

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Description & Features

Factory pre-set to a fixed range of 1,500 to 1,700 psi, this non-adjustable Relief Valve from SPX Hydraulic Technologies provides a straightforward, economical means of protecting hydraulic circuits against over-pressurization. The non-adjustable design eliminates the need for field calibration, making it well-suited for applications where a consistent, predetermined pressure limit is required.

Rated for a maximum flow of 5 gpm, the valve connects via a 1/8" male NPTF inlet, allowing direct in-line installation in compact hydraulic systems. It is compatible with single- and double-acting cylinder circuits and is cataloged under SPX High Force Hydraulics Products. Alternate catalog reference C1KN18 may be used to cross-reference this part.

SKU: RV21278-15

Supplier Part Number (MPN): RV21278-15

Alternate Part Numbers: C1KN18

Specifications

Connection Type
FNPT
Grp Application
Single- or double-acting cylinders. Permits adjusting operating pressures at various values below relief valve setting of pump. Operation: Regulator valve is easily adjusted to maintain pressures between 300 and 10,000 psi. Maintains a given pressure sett
grp RV21278 Relief Valves
Application: Provide An Economical Means of Protecting A Hydraulic Circuit Against Over Pressurization, Factory Pre-set, Maximum Flow Rate of 5 gpm, 1/8 NPTF Male inlet
Media
Hydraulic Oil
Number of Ports/Ways
1
Series
RV21278 Series

Product Questions & Answers (2)

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Question by: Wade M on Dec 16, 2025, 4:37 PM
Will this relief valve work with my single-acting cylinder setup?
Answer by: Customer Support on Dec 18, 2025, 6:01 AM
This relief valve is compatible with both single- and double-acting cylinder circuits.
Question by: Norm W on Sep 13, 2025, 3:53 PM
got a fixed-pressure setup, so i dont need to mess with adjustments. what pressure does this relief valve crack at?
Answer by: Customer Support on Sep 15, 2025, 6:26 AM
Factory setting is fixed in the 1,500 to 1,700 psi range, and it is non-adjustable so it stays at that predetermined limit for circuit over-pressure protection.

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