■ Brief introduction

The executive system is pneumatic driven. A single cylinder or double cylinders are available according to the size of valve diameter. The advantages of semi-spherical valves have been fully developed to fulfill automation or semi-automation of valve operation. They are divided into 4 types: QBQ641W, QBQ641H, QBQ641M, and QBQ641M1, and have the following advantages:

 

1．Straight through. It is made for single direction sealing and an eccentric structure. The ball is divorced from the valve body when opening, therefore assuring a straight passage and making it impossible for the flow to be jammed.

2．Easy open and close. There is no contact between the valve core and the valve seat when opening, therefore causing little torque and free turning. While the function of squeezing and cutting between the semi-sphere and seat removes the fouling adhesives on the sealing surfaces when closing, therefore assuring a tight and reliable sealing.

3．The eccentric structure of the sealing surface enables an automatic repairing of the spherical wearing. This results in a good sealing, long working life, and safety and reliability.

4．The valve is a kind of hard sealing structure. Different anti-abrasive alloys are chosen for different medium. At the same time the hardness and anticorrosion are also guaranteed.

Model: BQ641M

Nominal diameter:DN50—600mm

Nominal pressure:PN1.0—4.0Mpa

Applicabletemperature: ≤425℃

Material: carbon steel, stainless steel, high temperature steel etc.

Medium: water, steam, sewage, grain pulp, paper puli.