Also known as a manual knife gate valve, knife-shaped gate is a gate which is always in close contact with the valve seat seal valves, the principle is to have a diameter the size of the opening round mouth the gate, the gate opening and closing by making the gate diameter with a round mouth out and do exactly match the action. The advantage of this is that the valve body bore no recess, the media will not jam jam, and has full bore flow of properties, which can be divided into soft seal sealing structure, hard seal structure. Transmissive knife gate valve is constructed with precision, good technology, compact structure, sealing seat for design activities, anti-wear and automatic compensation function, and thus longer life. In the process of closing and opening the gate valve has been close with the movement, making the valve opening and closing force is stable, and has cut off the media and so on. Valve leak rate: ≤1.3 × 10-7Pa.L / S Temperature:. -30 ~ + 150 ℃ Scope: pressure on both sides of the valve plate 105 ~ 1.3 × 10-7Pa when the valve is opened: ≤2.7 × 103Pa main Body parts and materials, the valve plate: stainless steel. Seals: Viton, bellows (seal), nitrile rubber. Connection Size (mm) manual manual valve and flapper valve, also known as a manual spiral flapper valve, mainly composed of frame, gate, screw, nut, hand wheels and other parts, by hand handwheel make screw gate drive along horizontal movement up and down repeatedly, so that the manual opening and closing flapper valve achieve the purpose. Knife gate valve has a simple and compact structure, reasonable design, lightweight materials, sealing, reliable, light and flexible operation, small size, channel flow, flow resistance, light weight, easy to install, easy to disassemble, etc., can work pressure 1.0MPa- 2.5MPa, lower operating temperature -29-650 ℃ case work. Knife gate valve has cut its function, can scrape the sealing surface of the adhesive material, the debris is cleared automatically seal leakage, stainless steel gate to prevent corrosion. Installation knife gate valve should be checked before installation 1. Install the valve cavity and sealing surfaces and other parts, does not allow dirt or sand attached; 2. The joints bolts evenly tightened requirements; 3. Check the packing requirements of pressed parts , both to ensure the packing seal, but also to ensure the gate open and flexible; 4. User Before installing the valve, the valve must be calibrated model, connection size and attention to the medium flow, to ensure consistency with the requirements of the valve; 5. When users install the valve must set aside the necessary space for the valve drive; 6. shall drive circuit wiring diagram; 7. knife gate valve must be regularly maintained, not free collision and extrusion, to avoid affecting the seal.