Introduction:

The valve stem axis deviates from the center of the disc and the center of the body at the same time, and the rotation axis of the valve seat has a certain angle with the axis of the valve body passage, which is called a triple eccentric butterfly valve.

The biggest feature of the triple eccentric butterfly valve is that the sealing structure is fundamentally changed. It is no longer a position seal, but a torsion seal, that is, it does not rely on the elastic deformation of the valve seat, but completely relies on the contact surface pressure of the valve seat to achieve the sealing effect. Therefore, the problem of zero leakage of the metal valve seat is solved in one fell swoop, and because the contact surface pressure is proportional to the medium pressure, the high pressure and high temperature resistance can also be solved easily.

Field of Application:

The triple eccentric butterfly valve is widely used in metallurgy, electric power, petrochemical, water supply and drainage, and municipal construction and other industrial pipelines with a medium temperature of 425 ℃ or less to adjust the flow rate and load and cut off the fluid.

The maximum pressure rating of the triple eccentric butterfly valve produced by ZG Valve can reach 2500 pounds, and the standard diameter can reach 120 inches.

The connection mode of the triple eccentric butterfly valve: the clamp, the lug, the flange, the ring connection, the butt welding, the jacket, etc. can be selected, and various structural lengths and standards can be corresponded.

The triple eccentric butterfly valve has a large choice of materials, high and low temperature, and various acids, alkalis and other corrosive media.

Features:

1. The triple eccentric butterfly valve integrates adjustment and cut-off, with strong controllability.

The triple eccentric butterfly valve produced by ZG valve is designed with double safety structure to prevent the deformation of the butterfly plate, the misalignment of the valve stem, and the biting of the sealing surface caused by the influence of fluid pressure and temperature. The ZG valve is equipped with two independent thrust rings on the lower side of the butterfly plate, so as to ensure the normal operation of the triple eccentric butterfly valve under any working conditions;

2.No dead zone design, small opening torque.

The shape of the valve plate of the triple eccentric butterfly valve is an elliptical cone, and its surface is welded with hard alloy, which has excellent wear resistance. The floating U-shaped stainless steel seat has the function of automatically adjusting the center. When the valve is opened, the elliptical cone sealing surface valve plate first detaches from the U-shaped elastic valve seat, and then rotates. The seat applies pressure to deform the valve seat until the valve seat closely matches the oval conical sealing surface of the valve plate. The butterfly plate does not scratch the valve seat when the valve is opened and closed, and the torque of the valve stem is directly transmitted to the sealing surface through the butterfly plate, and the opening torque is small, thereby eliminating the common jumping phenomenon when opening the valve.

3.Zero leakage, high temperature and high pressure resistance.

The biggest feature of triple eccentricity is that it fundamentally changes the sealing structure. It is no longer a positional seal, but a torsion seal, that is, it does not rely on the elastic deformation of the valve seat, but completely relies on the contact surface pressure of the valve seat to achieve the sealing effect. This kind of sealing structure enables the triple eccentric butterfly valve to achieve hard sealing VI level, achieving true zero leakage. At the same time, due to the selection of the metal valve seat and the structural characteristics of the face seal, the problem of high temperature and high pressure resistance is also solved.

Technical Specification：
Design Standard:

EN 593, MSS SP67, API 609, BS5155

Face to Face dimension: 

ISO 5752, EN 558, MSS SP67, API 609, DIN3202

End Standard:

ANSI B16.1 Class125LB & B16.5 Class150LB 

AS 2129 Table D & E   BS 10 Table D & E

DIN 2501 PN6, PN10 & PN16

EN 1092 PN6, PN10 & PN16

ISO 2531 PN6, PN10 & PN16

ISO 7005 PN6, PN10 & PN16

KS B 1511 / JIS B 2210 5K & 10K

MSS SP44 CL. 150LB AWWA C207

SABS 1123 Table 1000/3 & Table 1600/3

Top Flange: ISO5211

Test standard: API 598, ISO 5208, EN 12266

MATERIAL LIST

Dimensions (mm)