The present invention relates to improved butterfly valve on a kind of industrial pipeline, be the thin valve of a kind of body, drive unit and valve joint are provided with the shaft sealing inspection and adjust the hole, must not dismantle drive unit and other parts again, axial seal is adjusted or is changed by checking, the valve shaft sealing material adopts Expanded graphite.The drive unit outdoor type can prevent dust fully, protection against the tide and waterproof, and no matter valve is used in any operating mode, and drive unit all is in good lubricating status, guarantees the working life of valve.Butterfly valve is furnished with the adjustable mechanical limit stoper and valve plate opens and closes lever position indicator, and the arrow and the switch printed words sign of tangible switch direction all arranged on the wheel rim of driving handwheel.Mechanical cover adopts double sealing structure, and has anti-hammering function.Adopt the horizontal installation of valve shaft, the gate valve weight on the existing pipeline is very heavy, can not install on suspended piping, as install and must design a lot of supports, has wasted a large amount of metals and structural material and man-hour, and has influenced the traffic under the pipeline.
Provide a kind of body of a kind of insulating high corrosion resisting two-way sealed flange butterfly thin valve, butterfly valve reasonable mechanical structure, reliable, axle and valve plate close installation, open and close reliable, has positive and negative two way sealed function, be not subjected to during installation MEDIA FLOW to restriction, be not subjected to the influence of spatial position yet, can be on pipeline install arbitrarily.Valve shaft adopts the semiaxis structure, and valve plate adopts truss structure.Butterfly valve adopts two eccentric sealed structures, and the valve plate seal ring relies on valve body with center displacement and burn-ons outward or cast heat-preservating shell and pass in and out connecting tube device seal valve seat crush seal face when closing, and the seal ring pressurized is even, and has positive and negative two way sealed performance.Valve body is burn-on outward or is cast heat-preservating shell and the making of turnover connecting tube device seal valve seat built-up welding 1Cr18Ni8Ti Stainless Acid Resistant Steel, and valve sealing face has corrosion-resistant non-scaling, and is wear-resistant.Rubber seal is fixed on the valve plate with machinery type, and sound construction is convenient to the on-the-spot seal ring of adjusting or change.Anticorrosive, the characteristics of long service life, the liquid that adapts to low middle pressure impacts, and circulation area is big, and flow resistance coefficient is little, compact structure, aesthetic in appearance, volume is little, and is in light weight, hoisting capacity is convenient to I﹠M apart from reducing to minimum, and flexible operation, this valve are the update products that substitutes gate valve and stop valve.
A kind of insulating high corrosion resisting two-way sealed flange butterfly, include body, mandrel, valve body is burn-on outward or is cast heat-preservating shell and the connection of turnover connecting tube device for mechanical, corrosion-resistant characteristics, butterfly plate has cam action and except all contact frictions between Sealing in valve stroke and the valve seat, making it frequent keying is the sealing effect that still has all the time, seal ring contacts with valve seat with certain wrapping angle, face is equivalent to an elongated wedge again around centering on it equably, and make active force be evenly distributed on the valve seat fully, owing to be that valve seat is stressed, valve shaft adopts the semiaxis structure, and valve plate adopts truss structure.Butterfly valve adopts two eccentric sealed structures, and the valve plate seal ring relies on valve body with center displacement and burn-ons outward or cast heat-preservating shell and pass in and out connecting tube device seal valve seat crush seal face when closing, and the seal ring pressurized is even, and has positive and negative two way sealed performance.Valve body is burn-on outward or is cast heat-preservating shell and the making of turnover connecting tube device seal valve seat built-up welding 1Cr18Ni8Ti Stainless Acid Resistant Steel, and valve sealing face has corrosion-resistant non-scaling, and is wear-resistant.Rubber seal is fixed on the valve plate with machinery type, and sound construction is convenient to the on-the-spot seal ring of adjusting or change.
Can high temperature resistantly corrode with height with 316L, this valve can isolate fire and play anti-fire action when cutting out, be widely used in: oilfield exploitation, chemical industry, petrochemical industry, coal gas, rock gas, thermoelectricity, water power plant, iron and steel, urban construction, tap water, sewage treatment, pharmacy, engineerings such as food are particularly used on the pipeline transport engineering.
The present invention is easy to use, exchange to install light and handy, when below adopting during embodiment, gate valve under pressure and the material and stop valve, its weight only is 1/3 of gate valve and stop valve, so has reduced cost greatly.
Describe details and the working condition that proposes concrete structure according to the present invention in detail below in conjunction with Fig. 1.This invention is by 1, end cap 2, socket head screw 3, pad 4, valve rod 5, copper sheathing 6, valve body is burn-on outward or is cast heat-preservating shell and turnover connecting tube device 7, dish plate 8, seal ring 9, trim ring 10, hex screw 11, pin 12, filler 13, Gland 14, support 15, double-screw bolt 16, packing ring 17, stud 18, nut 19, compositions such as control gear, control gear connects mandrel, valve body is burn-on outward or is cast heat-preservating shell and turnover connecting tube device sealing surface 7 and butterfly plate 8 sealing couplings, butterfly valve adopts two eccentric sealed structures, dish plate 8 seal rings rely on valve body with center displacement and burn-on outward or cast heat-preservating shell and turnover connecting tube device seal valve seat crush seal face when closing, the seal ring pressurized is even, and has positive and negative two way sealed performance, to reach sealing purpose.
