The Series 37G is a special adaptation of the Series 37. The 37G can be completely inserted into a pipe which effectively gives it a zero face-to-face dimension. The outside diameter of the 37G’s cuff is fabricated to precisely match the inside diameter of the pipe, providing a press-fit. The valve is supplied with an internal expansion clamp to provide compression between the valve and pipe I.D. The 37G can even be fabricated for elliptical or out of round pipe (consult factory for special fabrications).
As with the Series 37, the bill does not flare and the headloss of the 37G is higher than other styles of Tideflex Check Valves. The 37G is predominantly used in gravity-driven outfall pipes and in manholes and vaults where the valve is inserted into the effluent pipe and compressed to the pipe I.D. with the expansion clamp. The 37G can be inserted into the end of a pipe, but access to clamp should be from upstream of the valve, not through the bill of the valve. For those applications where there is no access to the upstream side of the valve, the 37G Thimble Insert is the solution.
For higher backpressure ratings or to lower headloss while maintaining backpressure ratings, the Saddle Support Technology (SST) can be used in conjunction with the Series 37-G.
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