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| Number | Title | Issue Date |
| 4793590 | Piloted check valve A piloted check valve includes a closure that is pressure balanced to relieve pressure on non-metallic seat when valve is closed against high pressure differential. The closure includes a disc having a stem moving in a sealed chamber communicating through... | 12/27/1988 |
| 4493335 | Shear valve A shear valve includes vent, supply and regulated ports, with the latter two including coaxial connection means.... | 01/15/1985 |
| 4456028 | Relief gate valve A valve comprises a hollow body having an inlet and an outlet, a seat ring in the outlet provides a face adapted to engage a gate, a closure mounted for movement relative to the seat ring and including a carrier having a passage therethrough in which are ... | 06/26/1984 |
| 4253481 | Cushioned shuttle valve A shuttle valve includes a tubular body having two, coaxial, inlet ports at its ends, and a transverse outlet port at its side. An internally threaded connector ring is secured over each port by cap screws. A cage having an external radial flange is telescopic... | 03/03/1981 |