Mining electric flange cast steel ball valve

一、 BQ941F-16C DN200Mining electric flange cast steel ball valvesummary:

Cast steel electric flange mining ball valveIt is a rotary ball valve with a 90 ° angle, excellent sealing performance, high flow capacity, low flow resistance coefficient, simple structure, easy maintenance, long service life, and the valve body channel and connecting pipe diameter are equal and form one diameter. The medium can flow through almost without loss. The product is usually used in occasions with strict sealing requirements. In addition to controlling gas, liquid, and steam media, it is also suitable for controlling sewage and media containing fibrous impurities. It is widely used in various fields such as petroleum, chemical, metallurgical, light industry, papermaking, power plants, refrigeration, etc.

二、 BQ941F-16C DN200Mining electric flange cast steel ball valveFeatures:

1. Ball valve is one of the types of valves with low flow resistance Z, and its opening and closing are quick and convenient. As long as the ball rotates 90 °, it can complete the fully open or fully closed action, achieving rapid opening and closing.
2. Bidirectional sealing with good sealing performance. The valve seat is generally made of polytetrafluoroethylene material. Due to the floating nature of the ball of the floating ball valve, under the action of medium pressure, the ball can produce a certain displacement towards the outlet end and press tightly against the sealing surface at the outlet end, and the sealing force increases with the increase of medium pressure.
3. The valve stem adopts an anti blowout structure design, which ensures that the valve stem will not be blown out by the medium even in the event of abnormal pressure rise in the valve chamber or failure of the packing pressure block. Moreover, the valve stem adopts a bottom mounted design, and the reverse seal of the valve stem also increases with the increase of medium pressure.
4. The valve stem packing adopts a V-shaped sealing structure, which can effectively convert the compression force and medium force of the packing cover into the sealing force of the valve stem. The traditional packing gland has been changed to a two-piece structure design consisting of packing pressure plate and packing pressure sleeve. The packing pressure sleeve and packing pressure plate are in spherical contact to ensure that the packing gland is always vertical. A PTFE liner is also installed inside the packing pressure sleeve to avoid scratches and wear on the valve stem and packing pressure sleeve, reducing the operating torque of the valve.
5. Anti static structures can be set up according to customer requirements, forming an electrostatic channel between the ball and valve body through the valve stem, so that the static electricity generated during the opening and closing process of the ball and valve seat can be led to the ground through the valve body, preventing the fire or explosion hazards that may be caused by static sparks.
6. Easy to install electric and pneumatic actuators, saving installation space. Equipped withTCD. TCHQ and other series electric actuators can be controlled by AC220V or AC380V power supply to operate and open/close valves.

3、 Working principle:

start-up process
In the closed position, the ball is tightly pressed against the valve seat by the mechanical pressure exerted by the valve stem.
When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angular plane causes the ball to detach from the valve seat.
The valve stem continues to lift and interacts with the guide pin in the spiral groove of the valve stem, causing the ball to start rotating frictionlessly.
Until it reaches the fully open position, the valve stem is lifted to the limit position, and the ball rotates to the fully open position.
Closing process
When closing, rotate the handwheel clockwise and the valve stem begins to descend, causing the ball to move away from the valve seat and begin to rotate.
Continuing to rotate the handwheel, the valve stem is subjected to the action of the guide pin embedded in its spiral groove, causing both the valve stem and the ball to rotate 90 ° simultaneously.
When it was about to close, the sphere had already rotated 90 degrees without contact with the valve seat.
After a few turns of turning the handwheel Z, the angular plane at the bottom of the valve stem mechanically wedges and presses the ball tightly against the valve seat, achieving * sealing.

4Installation precautions:

(1) Remove the protective covers on both sides of the flange end and rinse and clean with the valve * open.

(2) Before installation, the entire machine should be tested according to the specified signal (electric or pneumatic) to prevent vibration from affecting performance during transportation. Only after passing the test can it be installed online (wiring should follow the electric actuator circuit diagram).

(3) Before connecting to the pipeline, it is necessary to flush and remove any remaining impurities in the pipeline (which may damage the valve seat and ball).

(4) During installation, please do not use the actuator part of the valve as a lifting point to avoid damaging the actuator and accessories.

(5) This type of valve should be installed in the horizontal or vertical direction of the pipeline.

(6) The pipeline near the installation point should not have any low hanging or external force bearing phenomenon. Pipe supports or supports can be used to eliminate the deviation of the pipeline.

(7) After connecting to the pipeline, please cross tighten the flange connection bolts with the specified torque.