First, it works: valve R & D and production of a strong Germany F343CX worm fan-shaped blind plate valve, also known as worm gear fan-shaped glasses valve, flap valve, fan-shaped valve body from the left, in the body, right body, the fan-shaped blind plate, wire rod nut, stainless steel compensators, two worm gear drive mechanism and other components. It is fused through the three screw, and three body fixed to the base to form a rigid structure. Swelling in the body and the right body with stainless steel tube connected to the left, in the body with trapezoidal thread about the three at both ends with screw connection, the three screw for forward (or reverse) rotation, the left The two body compression (or separation). Three screw in a screw above the middle with a blind flange, blind plate around the axis of rotation. Following two screw installation in the same parts of the positioning block, the blanking plate to prevent rotation of the blind flange blind plate drift, to avoid the ring scratches, in which a screw is equipped with worm drive mechanism to achieve release the clamping The purpose of the body. 
 Second, the performance parameters: 

 Nominal pressure MPa, 0.25 0.15 0.10 0.05 
 Sealing test pressure MPa 0.275 0.165 0.11 0.055 
 Strength test pressure (MPa) 0.40 0.225 0.15 0.075 
 Applicable temperature ° C nitrile rubber silicone rubber Viton 
 <120 <250 <300 
 Suitable medium gas and other toxic, hazardous, flammable gases 
 The standard connection flange size the JB/T81-94 standard detection methods in line GB/T13927-92 standard 
 Body of the main components of materials, the gate for carbon steel; connecting shaft, expansion joints of carbon steel or stainless steel; seals of rubber