ST double eccentric high performance butterfly valve is used as a component to realize the pipe system cutting and flow control. The unique two-piece valve seat adopts the composite structure of sealing ring wrapped with energy increasing ring with memory characteristics. The application of winding sealing technology eliminates the influence of abrasion, plastic deformation, temperature and pressure changes to achieve reliable sealing.
Double eccentricity high performance butterfly valve has two eccentricity: one is the sealing surface center line deviation axis of the rotary center;The other is that the center of rotation of the axis deviates from the center line of the fluid channel.
Double eccentric high performance butterfly valve has compact structure, light weight, reliable sealing, convenient installation and maintenance, and long service life.Double eccentric high performance butterfly valves comply with API 607 fire protection standards.
Driving device: handle, worm wheel, electric, pneumatic etc.
Suitable for petroleum, natural gas, chemical, water heating, electric power and other industries.It is widely used in automatic control system of production process for continuous adjustment or switch operation.Suitable for corrosive chemicals, water, gas, acid, alkali, hydrocarbon and other media.
Structure Features:
1、The unique two-piece valve seat adopts the composite structure of the sealing ring with momory characteristics wrapped by the increase energy ring,and the winding sealing technology eliminates the influence of abrasion,plastic transformation,temperature and pressure change,so as to schieve reliable sealing.
2、Unique composite structure seat,bidirectional elastic seal,bidirectional zero leakage,automatic compensation of temperature and pressure changes,sealing pair adjustment range is large,long service life,small maintenance.
3、Grooves and teeth on the body and seat platen effectively ensure that the seat is well held in the desired position.
4、The valve seat is easy to repair and maintain,It is not necessary to remove the butterfly plate and valve stem to replace the valve seat.
5、The valve seat does not contact with the butterfly plate.There is no wear point on the upper and lower partsof the valve seat and low operation torque.
6、The valve body is designed with internal travel limit block to prevent the butterfly plate from overclosing,reduce the possibility of seat damage,and extend the service life of the seat.
7、Reduced operating torque and supporting coet.
8、The packing can be automatically loaded with spring to meet the requirements of micro leakage.
9、According to customers' requirements,we can produce high performance butterfly valves with double eccentric fire safety and meet API 607 standard.
10、According to customers' requirements, it can be eqiupped with handle,worm wheel,electric,pneumatic and other driving devices.
Design Specification:
Design criteria:API 609、GB/T 12238
Structure length:API 609、ASME B16.10、GB/T 12221
Connection standard:ASME B16.5、ASME B16.25、GB/T 9113、HG/T 20592
Inspection and testing:API 598、GB/T 13927、JB/T 9092、GB/T 26480
Fire test:API 607
Pressure and temperature classes:ASME B16.34、GB/T 12224
Performance parameters:
Main material:carbon steel、stainless steel、alloy steel
Serling ring materials:PTFE、EPDM、VITON
Norminal siza:NPS 2''~NPS 60" DN50~DN1500
Pressure range:class 150~class 600 PN10~PN100
Operation temperature:-46℃~ +180℃
Application:petroleum,natural gas,chemical engineering,water heating,electric power,etc
