Specifications

Stainless Steel Knife Gate Valves / Mining Equipment   

Product Feature

Knife Gate Valve— Product feature

Wafer-type seamless gate valve is used to processing abrasive materials containing particles or sediments. It is characterized by compact structure, small volume, low weight, convenient operation and maintenance. Dependent on different abrasive and pressure situation, three kinds of shutter materials are provides-----stainless steel, UHMWPE (Ultrahigh molecular weight polyethylene)and mixture of stainless steel and UHMWPE. The addition of lubrication fitting to valve can diminish the shutter friction and the valve moment. Lining is made of Xinhai rubber and replaceable.

LWXZF serial valves are usually provided in the manual version, but the electric and pneumatic versions are available according to clients’ demands. Filed operation and remote control are both achievable. The structure length and flange size are usually manufactured by national standard, but we also provide the custom-made products to meet clients’ requirements.

 

Gate valves are characterized as having either a rising or a non-rising stem. Rising stems provide a visual indication of valve position because the stem is attached to the gate such that the gate and stem rise and lower together as the valve is operated. Non-rising stem valves may have a pointer threaded onto the upper end of the stem to indicate valve position, since the gate travels up or down the stem on the threads without raising or lowering the stem. Non-rising stems are used underground or where vertical space is limited.

Bonnets provide leak-proof closure for the valve body. Gate valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest, offering a durable, pressure-tight seal. Union bonnet is suitable for applications requiring frequent inspection and cleaning. It also gives the body added strength. Bolted bonnet is used for larger valves and higher pressure applications.

Another type of bonnet construction in a gate valve is pressure seal bonnet. This construction is adopted for valves for high pressure service, typically in excess of 15 MPa (2250 psi). The unique feature about the pressure seal bonnet is that the body - bonnet joints seals improves as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.

Gate valves may have flanged ends which are drilled according to pipeline compatible flange dimensional standards. Gate valves are typically constructed from cast iron, ductile iron, cast carbon steel, gun metal, stainless steel, alloy steels, and forged steels.

XWXZF/D-1.6 series