Top 10 Chinese Polyacrylamide Brands Worth Knowing: An Industry Overview
09,21,2026 14 views
Jiangsu Bell Valve Electrical Installation
/Electric valve actuator complete set series/
Company Profile
Jiangsu Bell Valve Control Co., Ltd. is a Sino British joint venture holding enterprise that fully introduces advanced technology and management concepts from British company BAR, and has gained a good reputation and product recognition from the society. The company's certificates include: High tech Enterprise Certificate, High tech Product Certification Certificate, CE Certification Certificate, Explosion proof 3C Certification Certificate, SCL Certification, SI Certification, Protection Level Certification Certificate, Inspection Report Certification, 3A Credit Certification, Integrity Quality Certification, Quality System Certification, Explosion proof Qualification Certification and other certificates.
Gate valves can be classified according to the structure of the valve stem
01
Bright stem gate valve: The valve stem nut is attached to the valve cover or bracket. When opening and closing the gate, the valve stem nut is rotated to achieve the lifting and lowering of the valve stem. This structure is beneficial for the lubrication of the valve stem and has a clear degree of opening and closing, so it is widely used.
02
Hidden stem gate valve: The valve stem nut is located inside the valve body and comes into direct contact with the medium. When opening and closing the gate, use a rotating valve stem to achieve this. The advantage of this structure is that the height of the gate valve remains constant, so the installation space is small, making it suitable for gate valves with large diameters or limited installation space. This structure should be equipped with an opening and closing indicator to indicate the degree of opening and closing. The disadvantage of this structure is that the valve stem thread not only cannot be lubricated, but also directly accepts the erosion of the medium, which is easy to damage.
The difference between concealed stem gate valve and open stem gate valve
01
The lifting screw of the concealed flange gate valve only rotates and moves up and down, with only one rod exposed. Its nut is fixed to the gate plate, and the gate plate is lifted by the rotation of the screw, without a visible frame; The lifting screw of the rising stem flange gate valve is exposed, and the nut is tightly attached to the handwheel and fixed (without rotation or axial movement). The gate plate is lifted by rotating the screw, and the screw and gate plate only have relative rotational motion without relative axial displacement. The appearance is a gate shaped bracket.
02
The concealed valve cannot see the lead screw, while the exposed valve can see the lead screw.
03
When the concealed stem valve is opened and closed, the steering wheel and valve stem are connected together and relatively stationary. It is opened and closed by driving the valve disc upward and downward by rotating the valve stem at a fixed point. Bright stem valves use the threaded transmission between the valve stem and steering wheel to lift or lower the valve disc. Simply put, a rising stem valve is a valve disc that moves up and down together with the valve stem, while the steering wheel remains at a fixed point.
