A fixed ball valve is a type of valve suitable for high-pressure, large-diameter pipeline systems. It belongs to the structural types of ball valves. Its ball is rigidly connected to the valve body via upper and lower stems, while the valve seat employs a floating design. Bidirectional sealing is achieved by the medium pressure pushing the sealing ring to press the ball. It features low fluid resistance and a compact structure.
This valve utilizes a dual sealing mechanism combining spring preload and medium pressure. For diameters of DN200 and above, a grease injection valve can be installed to enhance sealing reliability. A pivot or support plate structure is used to reduce operating torque.
GNEE Group specializes in manufacturing valve products and is ISO certified. ISO-certified valves come with a compliance checklist included with your order!
fixed ball valve Technical parameters
Nominal Diameter: DN50～DN1200
Structure: Spherical
Nominal Pressure: 1.6Mpa～42.0Mpa, 150LB-2500LB
Connection: Flange
Applicable Temperature: -20～+100℃～+550℃
Actuation Method: Manual, Worm Gear, Pneumatic, Electric
Valve Body Material: Cast Steel, Stainless Steel
Manufacturing Standard: GB (Chinese National Standard), DIN (German Standard), API (American Standard), ANSI (American Standard)
Applicable Media: Water, Steam, Gas, Gases, and Corrosive Liquids
Wide Applications: Petroleum, Chemical, Power, Environmental Protection, Water Conservancy, Heating, Water Supply and Drainage, Industrial, Machinery
Fixed Ball Valve Working Principle
Opening Process
1. In the closed position, the ball is pressed firmly against the valve seat by the mechanical pressure of the valve stem.
2. When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angled plane disengages the ball from the valve seat.
3. The valve stem continues to rise and interacts with the guide pin in the valve stem's spiral groove, causing the ball to begin rotating without friction.
4. Until the fully open position, the valve stem rises to its limit, and the ball rotates to the fully open position.
Closing Process
1. When closing, rotating the handwheel clockwise causes the valve stem to descend and the ball to leave the valve seat and begin rotating.
2. Continuing to rotate the handwheel, the valve stem is acted upon by the guide pin embedded in its spiral groove, causing the valve stem and ball to rotate simultaneously by 90°.
3. Near the close, the ball has rotated 90° without contacting the valve seat. 4. During the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wefts and presses the ball tightly against the valve seat, achieving a complete seal.
fixed ball valve Structural Features
1. Frictionless opening and closing. This function completely solves the problem of friction between sealing surfaces affecting the seal in traditional valves.
2. Top-entry structure. Valves installed on pipelines can be directly inspected and maintained online, effectively reducing equipment downtime and lowering costs.
3. Single valve seat design. Eliminates the problem of abnormal pressure rise in the valve cavity affecting operational safety.
4. Low torque design. The specially designed valve stem allows for easy opening and closing with just a small handwheel.
5. Wedge-shaped sealing structure. The valve relies on the mechanical force provided by the valve stem to press the ball wedge against the valve seat for sealing, ensuring reliable sealing performance under various operating conditions, unaffected by pipeline pressure differential changes.
6. Self-cleaning structure of the sealing surface. When the ball tilts away from the valve seat, the fluid in the pipeline passes through the ball's sealing surface in a 360° uniform manner. This not only eliminates the local scouring of the valve seat by the high-speed fluid, but also washes away the accumulated substances on the sealing surface, achieving the purpose of self-cleaning.
Fixed Ball Valve factory
