U.S. Plastic Corporation Praher Knife Gate Valves 21059

Inexpensive valves for industrial, agricultural, and commercial markets. Ideal for quick shut-off in low pressure or vacuum lines. Valve can handle 20" Hg vacuum in closed position and 7" Hg vacuum in open position. White and gray are PVC construction, Black are UV resistant ABS construction. Santoprene (TPE) lip-type seals. EPDM O-rings. 303/AA stainless steel shaft and hardware. Full flow design with unrestricted flow. Maximum operating pressure: 1-1/2" to 2-1/2" - 50 psi @ 70F, 3" to 4" - 40 psi @ 70F, 3.5 bar @ 20C. 3" and 4" valves have glass reinforced polypropylene handles, double O-ring shaft seals, molded mounting pads on valve body for installing mechanical locks in closed position, 1/4" x 20 thread on shaft for easy retention, and come standard with the gatekeeper safety clip to prevent unintentional closing. 1" - 2" have factory pressed on handles. 2" and 4" have internal snap locks for gate locking in open position. These valves are great for use in irrigation, pools, spas, plumbing, waste water control, septic systems, IBC products, aquaculture, tank drain valves, and carpet/extraction equipment.