Three-way valve diaphragm structure feature decomposition: 1. Box axis fixed ball design, the 3-way diaphragm valve based on sphere situation can be divided into two kinds of fixed and floating ball. Domestic product structure of the floating ball, as usual sphere under the pressure of medium sphere compression in the outlet seal face, achieves the closed day, once the body import and export pressure difference is bigger, the prison distance very often in open field. Three-way valve diaphragm adopted high strength steel satin stem website construction price, PTFE (by outsourcing Ptfe) Stainless steel bearings do support smooth right rotation. Because pivot support stem can drain pipeline medium pressure that generates the thrust, and can reduce the friction between the ball and seat, so even under full differential pressure, the operation of concave door torque requirement is very low, still tee pneumatic stainless steel gate valve switch. 2. Rotating seat design, when the 3-way diaphragm valve near the barrier or just open valve ball and seat between the narrow point location ( At 9 o 'clock position) The last cause leakage. DN300( Size and above) CAMERON ( Cameron) Downstream seat is on the dial are plucked on the valve ball rotation 15 degrees Celsius, so much the valve seat sealing surface in turn influenced by natural gas flushing, tee diaphragm valve open or closed after 12 to flushing of a unified parts, the whole seat wear uniform. Working life greatly extended. Regular tee diaphragm valve seat is fixed, the place of the seat damage after long running is fixed) Every time I will cause the drain. Pipeline in operation after a period of time some harmful sediment can accumulate on the seat ring, cause the regular tee diaphragm valve jammed or can't normal seating, and rotating seat in turn called can eliminate cloudy appearance of foreign body seat ring. 3. Three-way valve diaphragm can reduce weight a quarter, and pipe bending and compression resistance to strengthen; Cancelled because tee diaphragm valve body of flange and bolt. The shape size decrease. With the call also eliminate the potential leakage passage. Keep the lubrication and pipeline connection no dead Angle, good medium flow. 4. Stem and secondary emergency greasing seating, upper stem district Po PFFE sealing material is a kind of low friction aging resistant material, long service life. DN50( Size and above) Tee diaphragm Industrial Valves stem is a sealing grease injection system, once into foreign body between the diaphragm valve seat and valve tee damage sealing surface, can still through the secondary injection of special sealing grease maintain seating. 5. Active internal relief valve cavity pressure and double lumen partition put pressure, tee diaphragm Industrial Valves is to take on the nasty double partition seating, but long running seat mount inevitable now wear; When tee diaphragm valve in the closed state, the You seat could be sure of leakage, leakage of the medium into the valve ball lumen. Special design of downstream seat can be useful to avoid the overpressure valve ball ten cavity, once the valve cavity pressure exceeds low pressure of about 138 kpa, will be dirty read off a sphere activities planning company, make the pressure relief in the downstream piping. Through the release of midplane pressure can also be measured here seat sealing performance. The pneumatic valve mass 1) Body materials, should with nodular cast iron, cast steel, stainless steel, 316 l, and indicate the brand and the physical and chemical testing data of cast iron practice. 2) Stem material, and strive to stainless steel stem ( 2CR13) , large diameter valves also should be embedded package of stainless steel stem. 3) Nut material, the use of cast aluminum bronze, brass or aluminum and hardness and strength were greater than the valve stem. 4) Stem bushing material, its hardness and strength shall be no greater than the valve stem, and soaking in the water condition and the valve stem, valve body don't form the electrochemical corrosion. 5) Pneumatic valve sealing surface of the material (1) have different categories, different sealing methods and material requirements; (2) normal wedge gate valve, the material of copper ring, fixed way and grinding way shall specify; (3) soft-sealing gate valve, valve plate rubber lining material physical chemistry and health testing data; (4) butterfly valves shall be marked on the valve body sealing materials and sealing surface on the butterfly plate material; Their physical and chemical testing data, especially the health requirements of rubber, ageing resistance, wear resistance; Usually use NBR and epdm and so on, are strictly forbidden to mixed with reclaimed rubber. 6) shaft packing (1) as the pneumatic valve in the pipe network, is usually open/close not frequent, packing in a few years no activity, the packing is not aging, long sealing effect; (2) valve shaft packing should also be under the frequent opening and closing, good seal effect; (3) in view of the above requirements, the valve shaft packing to lifetime don't change or more than ten years will not be changed; (4) packing if need to change, design should be considered to have hydraulic pneumatic valve replacement under the condition of measures. Variable speed drive box 1) Box body and the internal and external anti-corrosion material body principle and consistent. 2) Box should be sealed measures, box after assembly can withstand the 3 m the condition of water immersion. 3) The open/close limit device on the box body, the adjusting nut should be located in box outside or inside of the box body, but need special tools to work. 4) Only when driving structure design is reasonable, easy drive valve spindle rotation, don't make it jumped up and down, bite moderate transmission parts, do not produce with load separation skid when opening and closing. 5) Variable speed drive enclosure and valve leakage of the shaft seal is connected to form a whole, or should have reliable string of leakage prevention measures. 6) Part of the casing without sundry, gear wheels should have protection of grease.
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