flap valve manufacturer, flap valves distributor, flap valve factory--China Deland Valves Manufactring

Set up in 1995, China Deland Valves Manufactring Co.,Ltd. is one of the leading flap valve manufacturer, supplier and distributor in Yongjia County of Zhejiang Province. We manufacture all flap valves strictly conforming to the API, JIS, ANSI, BS, GB, NF and DIN standards. Our flap valves are available to users on request and are used for municipal works, petroleum, chemical industry, power station, metallurgy, national defense, and scientific research fields. We can supply custom, used, discount, cheap flap valve and accessory to USA, UK, Canda, Amercia, Europe, Germany, France, Japan, India, Iran, Russia, Poland and more than 30 countries in the world.

Valves are designed to Open under direct pressure and close when the direct pressure from the outfall fluid is relieved. The valve disc is offset from vertical to ensure positive closing. Flanged Flap Valves are available in a full range of sizes from 4” through 30” diameters. Components:- Body, Disc, Blade & FPM Seal. (CS/SS Body ring extra). Outside Dias made to suit flange Stds. (F/F=Face to Face in mm. PVC types available + 10% minimum. Encapsulated SS Hinge pins are standard. Full Flow Type '12P24' available 15mm-200mm size for max flow uses. Model PF-25F Waterman Model PF-25 flap valves are designed for use on pump discharge lines and other pipe end closures to prevent entrance of back water. These valves are furnished with a variety of frame styles to fit most installation needs. A 7 1/2" inclined seating plane is used to ensure that the valve will not "hang open" from slight pipe sagging or off grade. A positive stop prevents over opening. The flange model (PF-25F) may be furnished with either iron or bronze seat faces. Bronze hinge pins are standard. Drilling is ANSI 125 lb. standard.

Used on the discharge end of pipes to prevent backflow. Self-aligning resilient seat cover design for reliable performance. Flow responsive cast aluminum cover is standard. Brass hinge pin provides corrosion resistance and smooth operation. Slip-on mounting with O-ring seal for easy installation. Heavy-duty cast iron seat. In pumps requiring movement of large amounts of solid material, flap valves afford the most versatility. Our flaps valves are formulated to withstand repeated flexing in severe environments. Available in Hytrel®, Santoprene®, Geolast®, Polyurethane, Fluoroelastomer, Buna-N/Nitrile, EPDM, Neoprene & Food Grade Materials, our flap valves with will be suitable for most pumping applications. The popular compression model (PF-25W) uses time proven wedge type seals to install quickly and easily on plain end standard steel pipe. A special gasket is furnished for use with O.D. sized steel pipe. This model is standard with a cast iron frame with machined seat face and a cast iron cover with a resilient neoprene rubber seat face. Follow ring is cast iron with rubber wedge gasket and plated steel draw bolts.