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$38.72
The Hyvair CMM250S is a CMM series inline check valve with 1/4 in male NPT threads on both ends. A check valve lets fluid pass in one direction and blocks flow in the reverse direction. Because both ends are male pipe thread, the CMM250S threads directly into female ports or fittings with no adapters.
The body is machined from 12L14 steel. Inside, a stainless steel ball and spring work against a steel retainer, and the valve closes on a metal-to-metal seal. Working pressure is rated to 3000 psi (210 bar), and the temperature range runs from -20 °F to 400 °F.
Cracking pressure is 7 psi. That is the inlet pressure needed to lift the ball off its seat and start forward flow. The spring load gives the ball positive seating when flow stops or reverses. The flow coefficient is 0.5 Cv, a useful number when you size the valve against the flow your line carries.
For corrosion protection, the steel body is zinc plated and then sealed with a clear chromate finish. The two layers protect the exterior for longer service life in demanding environments. Use the CMM250S where a 1/4 in NPT line needs backflow protection at pressures up to 3000 psi.
