Gate is one the most widely used in all kinds of valves. Gate valve is closed along the channel axis of vertical direction valve, mainly for cut off the medium in the pipe on the road, that is fully open or close, rarely do adjust flow, gate valves are not suitable for conveying slurry medium. Gate valve is the most commonly used flat gate and wedge gate Industrial Valves, according to the structure of the stem, also can be divided into rising stem gate valves and non-rising stem gate valves. Flat gate valve can be divided into single sluice gate and double gate valve, another variant product type knife gate valve and slurry valves, knife gate valve and slurry valve is widely used in papermaking, water treatment industry. The following simple analysis of the first plate gate, wedge gate valves and knife gate valve. Flat gate valve is a kind of closed for the parallel slide valve of the gate. Close it a can be a single ram or a meantime double ram with open institution. Gate to the seat of the clamp force is by acting on the floating gate or the medium pressure to control the floating seat. If it is double ram plate gate between the two gate open institutions can complement the clamping force. Flat gate valve according to the drive mode can be divided into manual flat gate valve, pneumatic flat gate valve and electric flat gate valve. According to the purpose and use of the occasion can be divided into flat gate valve with flow guide hole, without diversion hole plate gate valve, oil field flat gate valve, flat gate valve and gas pipe line, flat gate valve and so on. Wedge gate valve, is a kind of gate valves. Because of the sealing surface and vertical centerline into a way that is named two seal face into wedges. In general, two seal face into a wedge gate valve, sealing surface and the Angle of the vertical centerline of 2 ° and 3 ° 30 ', 5 ° 52 ', 8 °, 10 °, etc. Wedge gate valve open-close part is ram, ram movement direction perpendicular to the direction of flow and the wedge gate valve can only be fully open and close, does not adjust and throttling. Wedge gate valve generally move up and down by rotating the handwheel stem with to complete the opening and closing of the valve. A rising stem wedge gate valves and non-rising stem wedge gate valve two kinds. Move up and down rising stem wedge gate valve is the valve stem, stem nut is fixed. Fixed non-rising stem gate valve is the valve stem, stem nut moves up and down the opening and closing has been completed. Knife gate valve, also known as type knife gate valve, knife gate valve, slurry valve, slurry valve, it is the opening and closing of a ram, the ram of the motion direction and perpendicular to the direction of flow on the blade shape ram can cut fiber cutting medium, sealing face has two gate, two of the most commonly used mode gate valve sealing surface form a wedge, the wedge Angle vary with the valve parameters, usually for 5 °, wedge type knife gate valve disc can be made into a whole, is called a rigid disc; Can also make it generates trace of deformation of ram, in order to improve the manufacturability, make up for the sealing surface Angle in the process of our processing deviation, this damper is called elastic disc. Chamber body actually does not exist, ram in side guide groove inside the elevator, and from the bottom of the lugs compression on the seat, if you need to achieve high sealing medium, o-type sealing seat can be used to realize two-way sealing. Knife gate valve has a small installation space, working pressure is low, not easy to pile up sundry, the price is low. ( Above is for simple generalization of conventional gate valves)
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