100mm 110mm 10 Inch 12 Inch Butterfly Control Valve 40mm 50mm 65mm 25mm

Butterfly valve

application

The series of the butterfly valves can be applied to food,drink,medicine,chemical industry,industrial environmental protection water treatment,high building,water supply,drainage and gas,etc.used to start or stop or adjust medium flow quantity,The major features of the structure.

Products design features

1,Simple structure,small volume,light weight,small installation dimension.

2,Having two kinds of seal material:soft and hard,can be used in various working conditions,with good sealing performance. and long life-span.

3,Anti-fire structure designed butterfly valve can prevent theexpanding of an accidental fire,once the soft sealing valve seat of the butterfly valve catches fire and damaged,the stainless steel seal ring will give play to make butterfly valve keep emergency sealed,

4,In the condition of the butterfly valve fully opened,it has little flow resistance,and in the condition of the butterfly valve partially opened,the flow quantity can be controlled sensitively.

5,Small driving torque, simple and fast operation

Sealing principle analysis

1. The sealing principle of the single eccentric buttertly valve

As the center of gyration af the disc(the center of valve spindle) andthe sealing section of the disc are set up in eccentric(a), it makes the sealing section of the disc gradually separate from the sealing section of the valve seat in the courseof opening the butterfly valve,when the disc revolves to 20°-25°,the sealing section of disc will completely brake away from the sealing section of the valve seat,and when completely opened,a gap X will be formed in two sealing sections,thusmakingtherelativemechanicalwear and extrusion decrease between two sealing section,and ensure the seal of the butterfly valve.

2.The sealing principle of the double eccentric seal butterfly valve

As making the center of gyration of the disc(the center of the valvespindle)form a polarization in size(b)with the central line of the valve bush,based on the single eccentric butterfly valve,which makes thesealing section of the disc brake away from the sealing section of the valve seat quicker than the single eccentric seal butterfly valve coes,in the course of opening the butterfly valve,when the disc revolves to 8°~12°,thesealing section of the disc will completely brake away from the sealing section of the valve seat and when completely opened. a bigger gap Y will be formed in two sealing sections. The design of this kind of butterfly valve can greatly decrease the mechanical wear and extrusion and deformation,and improve more the sealing performance of the butterfly valve.

3.The sealing principle of the three eccentric butterfly valve

As making the central line of the valve seat form a polarization inangle B with the central line of the valve bush,based on the double eccentric butterfly valve,which makes the sealing section of the discimmediately brake away from the sealing section of the valve seat at the moment of opening, and contact the sealing section of the valve seat at the moment of closing,during the course of opening and closing, When completely opened,a gap Y same to the double eccentric sealbutterfly valve will be formed in thetwo sealing sections.The design of this kind of the butterfly valve can completely remove the mechanicaI wear and scratch between the twosealing section,and greatly improve the sealing performance and life-span of the butterfly valve.

4.The sealing principle of the various eccentric seal butterfly valve

The unique feature of the various eccentric buttertly valve is thevalve handle shaft for installationof the disc,with a structure of three-parts style.There are two parts with a concentric shaft, of the valve handleinthree-partsstyle,butthecentral line of the middle shaft is a centerline spacing away from the shalt line of the both sides,and thedisc is installed in the part of the middle shaft.This eccentric structure can make the disc be in the type ofthe double eccentric at the situationof fully opened,but in the single eccentric type when the disc is revolved. When approaching closing,the disc will move a distance towards thesealing conic section,and the sealing section of the disc and valve seat is in the reliability of sealing performance,because of the function of the eccentric shaft.