Zhejiang Guoji Fluid Control Co., LTD

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Three eccentric metal hard seal butterfly valve

Three eccentric metal hard seal butterfly valve
Butterfly valve has been widely used in many fields, such as petroleum, chemical, metallurgy, water and electricity, as a part to realize the on-off and flow control of pipeline system. In the known butterfly valve technology, the sealing form of sealing structure, sealing materials for rubber, ptfe and so on. Due to the limitation of structure characteristics, it is not suitable for high temperature, high pressure, corrosion resistance, wear resistance and other industries. There is a more advanced butterfly valve is three eccentric metal hard seal butterfly valve, valve body and valve seat are joined component, valve seat sealing surface layer surfacing welding temperature, corrosion resistant alloy material. Multi-layer soft stack sealing ring fixed on the valve plate, this butterfly valve compared with the traditional butterfly valve has high temperature resistance, light operation, opening and closing without friction, closed with the torque of the transmission mechanism to compensate for the sealing, improve the sealing performance of the butterfly valve and prolong the advantages of service life.
Butterfly valve has been widely used in many fields, such as petroleum, chemical, metallurgy, water and electricity, as a part to realize the on-off and flow control of pipeline system. In the known butterfly valve technology, the sealing form of sealing structure, sealing materials for rubber, ptfe and so on. Due to the limitation of structure characteristics, it is not suitable for high temperature, high pressure, corrosion resistance, wear resistance and other industries.
There is a more advanced butterfly valve is three eccentric metal hard seal butterfly valve, look at the valve body and seat are joined components, seat sealing surface layer surfacing welding temperature, corrosion resistant alloy material. Multi-layer soft stack sealing ring fixed on the valve plate, this butterfly valve compared with the traditional butterfly valve has high temperature resistance, light operation, opening and closing without friction, closed with the torque of the transmission mechanism to compensate for the sealing, improve the sealing performance of the butterfly valve and prolong the advantages of service life. However, the following problems still exist in the use of this butterfly valve:

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Full bore hard sealing ball valve

Fixed ball valve, is a new generation of high-performance ball valve, suitable for long-distance transmission pipelines and general industrial pipelines, its strength, safety, resistance to harsh environment, etc. in the design of special consideration, suitable for all kinds of corrosive and non-corrosive media. Compared with the floating ball valve, it works, the fluid pressure in front of the sphere of all is passed to the bearing force, will not make a sphere to the seat to move, so the seat will not bear too much pressure, so the fixed ball valve torque is small, the seat of the small deformation, stable sealing performance, long service life, applicable to high pressure, large diameter. Advanced spring pre-seat assembly with self-tightening characteristics for upstream sealing. Each valve has two seats and can be sealed in each direction, so installation is two-way with no flow restriction. This valve is generally installed horizontally.
Fixed ball valve has two and three pieces of two types of body structure, flange bolt connection, sealing using enhanced PTFE inserted into the stainless steel ring, ring rear with a spring to ensure that the seat close to the ball, to maintain sealing. The upper and lower stem are equipped with PTFE bearings to reduce friction and save labor in operation. The bottom of the small shaft is equipped with an adjustment piece to ensure the joint position of the ball and the sealing ring. Full size: valve flow aperture to line id for line cleaning.
Fixed ball valve performance advantages:
1, operation labor saving: the ball is supported by upper and lower bearings, reducing friction, eliminating the excessive torque caused by the huge sealing load formed by the ball and the sealing seat driven by the inlet pressure. 2, reliable sealing performance: PTFE single material sealing ring embedded in the stainless steel valve seat, metal valve seat tail with a spring to ensure that the sealing ring enough pre-tightening force, the valve in the use of the sealing surface wear, under the action of the spring valve to ensure good sealing performance.
3, the structure of the fire prevention: to prevent because of heat or fire, make ptfe sealing ring burned, larger leakage occurs, and feeds the fire, set up fire prevention sealing ring between the sphere and valve seat, burned down in sealing ring, in under the action of spring force, the seat ring is rapidly to the sphere, form the metal to metal seal, have a certain degree of sealing effect. Fire resistance test conforms to APl6FA and APl607 standard requirements. 4, automatic pressure relief function: when the medium pressure of the valve chamber stagnates abnormally when it exceeds the pre-force of the spring, the seat recede from the ball to achieve the effect of automatic pressure relief, and the seat automatically after pressure relief
5, discharge pipeline: the upper and lower parts of the valve body are provided with discharge holes, can check whether the valve seat leakage, in the work, the valve is fully open or fully closed, remove the pressure in the middle chamber, can directly replace the packing; It can discharge the residue in the cavity and reduce the pollution of the medium to the valve.
Fixed ball valve application range:
Fixed ball valve is suitable for Class150 ~ Class1500, PN16 ~ PN100, JIS 10K ~ JIS 20K all kinds of pipeline, used to cut off or connect the pipeline medium, choose different materials, can be respectively suitable for conveying water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, etc. It is widely used in petroleum refining, long-distance pipeline, chemical industry, paper making, pharmaceutical, water conservancy, electric power, municipal administration, steel and other fields. Fixed ball valve drive mode for worm gear and worm drive, manual, pneumatic or electric. Fixed ball valves are generally connected with flanges, but also can be welded

1. Because the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is normally open, the medium forms a positive scouring on the sealing surface, and the soft sealing belt in the interlayer of the metal sheet is washed, which directly affects the sealing performance.
2. Restricted by structural conditions, the structure is not suitable for valves with diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.
   Three, because of the principle of three eccentric structure, the seal between the sealing surface of the valve plate and the valve seat is by the torque of the transmission device to pressure the valve plate to the valve seat. Positive flow state, the higher the medium pressure seal extrusion tighter. When the flow channel medium countercurrent with the increase of medium pressure valve plate and valve seat unit positive pressure is less than the medium pressure, the seal began to leak.
   High performance three eccentric bidirectional hard seal butterfly valve is characterized in that the valve seat sealing ring is composed of multiple layers of stainless steel on both sides of the soft T-shaped sealing ring. The sealing surface of valve plate and valve seat is inclined cone structure, and the temperature and corrosion resistant alloy material is surfacing on the surface of valve plate inclined cone; The spring fixed between the regulating ring platen is assembled with the adjusting bolt on the platen. This structure effectively compensates the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem existing in the process of two-way interchangeable medium transportation of the valve.
   The sealing ring is composed of soft T-type multilayer stainless steel sheet on both sides, which has the double advantages of metal hard sealing and soft sealing, and has zero leakage sealing performance under low temperature and high temperature. The test proves that the pressure of sealing surface is produced by the torque of transmission device and the pressure of medium on valve plate when the flow direction of medium is the same as the rotating direction of butterfly plate. Positive medium pressure increases when the valve plate oblique cone surface and valve seat sealing surface extrusion is tighter, the sealing effect is better. When the countercurrent state, the seal between the valve plate and the seat by the torque of the driving device to pressure the valve plate to the seat. With the increase of the reverse medium pressure, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the deformation stored by the spring of the regulating ring under load can compensate the tight pressure of the sealing surface of the valve plate and the valve seat to automatically compensate. Therefore, the utility model does not install soft and hard multilayer sealing rings on the valve plate like the prior art, but directly install them on the valve body, and the regulating ring is added between the pressure plate and the valve seat, which is a very ideal bidirectional hard sealing mode.

JD745X diaphragm multifunctional water pump control valve

JD745X diaphragm multifunctional water pump control valve is installed in the water supply system of high-rise buildings and other water supply systems at the pump outlet, to prevent media backflow, water hammer and water strike phenomenon of intelligent valve. JD745X diaphragm multifunctional water pump control valve has electric valve, check valve and water hammer eliminator three functions, can effectively improve the safety and reliability of the water supply system. And the slow opening, fast closing, slow closing to eliminate water hammer technical principle integration, to prevent the production of open pump water hammer and stop pump water hammer. Just operate the opening and closing button of the pump motor, and the valve can automatically open and close according to the pump operation rules, with large flow and small pressure loss. Diaphragm type for DN600 caliber below the valve.

Welding type metal hard seal butterfly valve

Welding type metal hard seal butterfly valve use:
Welding type metal hard seal butterfly valve is suitable for high temperature, high pressure, fire prevention, heat preservation and other pipelines for opening and closing or adjusting medium.

Two, welding metal hard seal butterfly valve features:
1, compact structure, small size, light weight, flexible operation, easy to use;
2, using three-dimensional eccentric elastic or multi-level hard seal structure, its sealing performance is reliable to achieve zero leakage;

3. The valve has no flange, which brings great convenience and beauty to the pipeline and heat preservation.
   4, with high temperature, high pressure, corrosion resistance, wear resistance and other characteristics.
   5, transmission type: worm drive, pneumatic drive, electric drive.

Three, welding metal hard seal butterfly valve standard:
Welding size :GB1224; ANSI B16.25; DIN2559
Length :GB/T12221-1989; API609
Pressure test :GB/T13927-1992; API598