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What is The Difference Between Triple Eccentric Butterfly Valve, Double Eccentric Butterfly Valve, Single Eccentric Butterfly Valve And Centerline Butterfly Valve

Centerline butterfly valve, single eccentric butterfly valve, double eccentric butterfly valve and triple eccentric butterfly valve, these kinds of butterfly valves change the sealing and opening state by setting the position of the valve plate shaft.

Under the same conditions, the rotation angle required for the valve plate to disengage from the seal when the valve is opened is smaller than the other, and the valve is subjected to torque larger than the other at each opening.

Triple eccentric butterfly valve:

For high temperature resistance, a hard seal must be used, but the amount of leakage is large; for zero leakage, a soft seal must be used, but it is not resistant to high temperature. In order to overcome the contradiction of the double eccentric butterfly valve, the butterfly valve was eccentric for the third time. The so-called third heart is the shape of the sealing pair is not a positive cone, but a slanted cone. The unique feature of the triple eccentric butterfly valve is that the valve on which the butterfly plate is installed is a three-section shaft structure. The two shaft sections of the three-section shaft valve stem are concentric, and the center line of the center section shaft is offset from the two ends of the axis by a center distance. The plate is mounted on the intermediate shaft section. Such an eccentric structure makes the disc become double eccentric when the disc is fully open, and becomes single eccentric when the disc is rotated to the closed position. Due to the action of the eccentric shaft, when it is close to closing, it moves a distance into the sealing cone surface of the valve seat, and the butterfly plate matches the sealing surface of the valve seat to achieve reliable sealing.

Double eccentric butterfly valve:

Based on the single eccentric butterfly valve, it is the most widely used double offset valve. Its structural feature is that the shaft center of the valve stem deviates from the center of the disc and the center of the valve body. The effect of double eccentricity enables the disc to be quickly separated from the valve seat after the valve is opened, which greatly eliminates unnecessary excessive extrusion and scratching between the disc and the valve seat, reduces the opening resistance, reduces wear, and improves the valve performance seat life.

Single eccentric butterfly valve:

In order to solve the extrusion problem between the disc and the valve seat of the concentric butterfly valve, the single eccentric butterfly valve is produced. Axial center, dispersion, reduce the excessive extrusion of the upper and lower ends of the plate and the valve seat.

Center-line butterfly valve

The structural feature of the center-line butterfly valve is that the shaft center of the stem, the center of the disc and the center of the valve body are in the same position. Because the butterfly plate and the valve seat are always in a state of extrusion and scraping, the resistance distance is large and the wear is fast. Simple and convenient structure. In order to overcome extrusion and scratching to ensure the sealing performance, the valve seat is basically made of elastic materials such as rubber or PTFE.

DIN FLANGED CAST STEEL GLOBE VALVE

When compared to a gate valve, a globe valve generally yields much less seat leakage.
This is because the disk-to-seat ring contact is more at right angles, which permits the force of closing to tightly seat the disk.
Globe valves can be arranged so that the disk closes against or in the same direction of fluid flow.

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DIN NON-RISING STEM GATE VALVE F5

1.Made of investment casting for the body of DIN Non-Rising Stem Gate Valve F5
2.Factory supplied with competitive price
3.All the test reports offered before shipment for approved
4.100% testing before shipment and ensure 0 leakage for DIN Non-Rising Stem Gate Valve F5

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DIN RISING STEM GATE VALVE F4

1.Made of investment casting for the body of DIN Rising Stem Gate Valve F4
2.Factory supplied with competitive price
3.All the test reports offered before shipment for approved
4.100% testing before shipment and ensure 0 leakage for DIN Rising Stem Gate Valve F4

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Post time: Sep-27-2022