butterfly valve

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Time: 18th, Feb, 2014

The selection of butterfly valve


The direction of the diameter of the butterfly valve butterfly plate installed in pipeline. Butterfly simple structure, small volume, light weight. Only by a few parts. But only can be rotated 90 กใ rapid opening and closing, simple operation, the valve has a good flow control characteristics. Butterfly valve in the fully open position, the disc thickness is only when the medium flows through the body resistance, thus generated by the valve pressure drop is small, it has a good flow control characteristics.

If asked to use as a flow control valve, the main choice is the right size and type of valve. Butterfly valve structure principle is particularly suitable for production of large diameter valves. Common butterfly valve wafer type butterfly valve and flange type butterfly valve two. Wafer type butterfly valve is the valve connection between two pipe flanges with bolts, flange type butterfly valve is a valve with a flange, on both ends of the valve flange used in pipe flange bolt.

Butterfly valve used to achieve piping system as an on-off and flow control components has been very widely used in many fields of petroleum, chemical, metallurgical, power etc.. In the butterfly valve has been publicly known technology, the seal forms a sealed structure, and sealing materials for rubber, PTFE and so. As the structure of the restrictions, not suited to high temperature, high pressure and corrosion resistance, wear and other industries.

Present a more advanced three eccentric butterfly valve is a metal hard seal butterfly valve, valve and seat components for the piece, the valve seat sealing surface layer welding temperature, corrosion resistant alloy material. Stacked multi-layer soft sealing ring fixed in the valve plate, this butterfly valve compared with the conventional high temperature, easy operation, open and close without friction, closed with the transmission of the torque to compensate for increased seal, to improve a butterfly valve sealing performance and durability advantages.

However, this butterfly is still in the course of the following problems:

First, as hard and soft layers stacked ring fixed in the valve plate, when the valve plate normally open state media, the formation of its positive sealing surface erosion, sheet metal dissection of the soft seal by brushing with a direct impact on seal performance.

Two, by the structural constraints of the structure do not meet the following path DN200 valve, because the overall structure of valve plate is too thick, large flow resistance.

Three, because of the principle of the three eccentric structure, the sealing between the sealing surface and the valve seat plate is on the transmission of torque to the valve plate to the valve seat pressure. Positive flow state, the higher the pressure medium sealed tight squeeze. When the counter current flow when the medium with medium pressure valve plate and seat of the unit is less than the pressure medium pressure, the seal began to leak.

High performance three eccentric hard sealing butterfly valve, characterized in that: the valve seat sealing ring is made of soft T sealing rings on both sides of the composition of multi-layer stainless steel sheet. Valve plate and valve seat sealing surface for the oblique cone structure, oblique cone surface in the valve plate welding temperature, corrosion resistant alloy material; structure is fixed between the adjusting ring plate spring and the plate with the adjusting screw assembly.

This structure effectively compensate the flexible tolerance between the sleeve and the valve stem in the medium zone and deformation under pressure, solves the sealing problem of two-way valve in the transmission medium of exchange. The model T soft on both sides of multi-layer film composed of stainless steel ring, and has dual advantages of metal hard seal and soft seal, both in low and high temperature conditions, both with zero leakage sealing performance.

Pool tested positive flow state (medium flow direction and the disc rotating in the same direction), the sealing surface pressure is the role of the transmission of torque and media pressure on the valve plate. Positive medium pressure valve plate oblique cone surface and the valve seat sealing surface squeezed more tightly, sealing the better. When the current state, sealed by the drive torque to the valve plate to the valve seat between the valve plate and valve seat.

With the reverse medium pressure, valve plate and seat unit between the positive pressure is less than medium pressure, the adjustment ring spring deformation under loading of the stored energy compensation valve plate and valve seat sealing surface of the tight pressure to play the role of automatic compensation. Therefore, the utility model unlike the existing technology, software and hardware installed in the valve plate multi ring, but directly installed in the valve body, the middle seat in the plate and an additional adjustment ring is a very good way of two-way seal. It can replace the valve, the cut-off valve and ball valve.

Chinabase is able to offer custom, cost-optimized solutions in accordance with customer drawings - such as ready-to-install machine parts and profiles - in addition to our standard products.We can supply a full-range of power transmission products, such as Conveyor Chain, sprockets and plate wheels, pulleys,Flange, gearboxes,Ball Screw Set, motors, couplings,Ball Screw Support, gears and racks. Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes,Welding Fork,bolt-on hubs, torque limiters, shaft collars, motor bases and motor slides, chain detachers, Flange Fork,chain guides, universal joint, rod ends and yokes. Our products are used in many different industry sector, like in automation engineering, drive engineering, conveyor technology, assembly and handling technology, packaging industries, the beverage, food and medical engineering, pharmaceutical production, and laboratory equipment.

Article tags: butterfly valve,Ball Screw Set,Power Transmission.

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