DISTRIBUTOR-FIRST SUPPLY PARTNER · SINCE 1999 BRAND · CONRADER
American-made compressor controls matched by OEM cross-reference — the right valve for nearly any compressor already in the field.
Control. Protect. Repeat.
Conrader has been designing and manufacturing compressor controls and pneumatic valves in Erie, Pennsylvania since 1925 — over a century of focus on a single discipline. What started as a supplier to reciprocating compressor OEMs has grown into the go-to source for control and safety valves covering virtually every brand and horsepower class of compressor already installed in the field.
The product line is built around one practical advantage: an OEM cross-reference library that maps compressor make, model, and HP directly to the correct unloader, check, or safety-relief valve. That library turns what is normally a sourcing puzzle into a one-step transaction — the rep reads the nameplate and quotes the part. All products are manufactured in the US under an ISO 9001:2015 quality system.
Safety valves carry ASME Section VIII Division 1 certification and Canadian CRN registration, making them code-legal on the pressure points they protect. The CE-marked version extends the same compliance to European Pressure Equipment Directive requirements. Non-discretionary wear cycle, recurring demand, and a broad installed-base cross-reference make Conrader the MRO anchor for any compressed-air distributor's service business.
SPC carries Conrader as a Preferred partner and uses the OEM cross-reference library to quote the exact valve for a customer's installed machine — regardless of which brand built the compressor.
Compressor control and safety valves are non-discretionary service parts — they wear, leak, or fail on a cycle tied to runtime, not to capital budgets.
Through the member network channel, Conrader availability and pricing are backed by aggregated demand across the network, with SPC as the single point of contact for quoting, cross-referencing, and after-sale support.
General Manufacturing → Primary install base — reciprocating and rotary-screw compressors powering plant air. 
Automotive Manufacturing → Compressor controls and safety valves for paint, assembly, and tooling air systems. 
Metalworking & Fabrication → MRO safety and control valves for shop compressors powering machining and finishing. 
Food & Beverage Processing → Code-legal safety-relief valves on compressors serving food-contact air lines. 
Construction & Infrastructure → Portable compressor unloader and throttle controls for construction equipment. 
Oil & Gas / Energy → High-pressure check and safety valves for compression applications in energy operations. Reciprocating machines typically need a D or DL Series unloader valve plus an in-tank check valve. Rotary-screw machines call for a CMP minimum-pressure valve to protect the separator element, plus an N-Series combination unit for unloading. Use the OEM cross-reference to confirm the correct series by make/model/HP.
SRH hard-seat safety valves cover 25–350 PSI; SRV soft-seat covers 25–450 PSI. Match set pressure to the system's maximum allowable working pressure with a code margin — both series are ASME Section VIII Div. 1 certified.
CRN-registered models satisfy Canadian provincial pressure-vessel law. CE-marked variants meet European PED requirements. Specify the jurisdiction at order time so the correct stamping ships.
For scheduled PM intervals, Conrader's multi-valve MRO assortments bundle the unloader, check, and safety-relief valve for the specific compressor into one kit — one transaction covers the full valve inspection.
Tell us the spec and the account and we will come back with the right line, sourced through the distribution network.
—. We reply within one business day with pricing, lead-time, and configured parts.