Q611F Pneumatic Three-Piece Ball Valve

I. Introduction:

The Q611F pneumatic three-piece ball valve and butt-weld connection ball valve are divided into integral type, two-piece type and three-piece type. The valve body is cast using advanced technology introduced from Taiwan, with a reasonable structure and beautiful appearance. The valve seat adopts an elastic sealing structure, ensuring reliable sealing and easy opening and closing. The valve stem adopts a bottom-mounted structure with reverse sealing, so the valve stem will not be impacted when the valve chamber has abnormal pressure rise. A 90° switch positioning mechanism can be set, and a lock can be added as needed to prevent misoperation. The internal thread connection ball valve and butt-weld connection ball valve are suitable for various pipelines with PN1.0～4.0MPa and working temperature of -29～180℃ (sealing ring is reinforced polytetrafluoroethylene) or -29～300℃ (sealing ring is polyphenylene sulfide). They are used to cut off or connect the medium in the pipeline. By selecting different materials, they can be respectively suitable for various media such as water, steam, oil, nitric acid, acetic acid, ammonia brine, and neutralized water.

II. Advantages:
1. Small fluid resistance, with a resistance coefficient equal to that of a pipe section of the same length.
2. Simple structure, small volume and light weight.
3. Tight and reliable. At present, plastic is widely used as the sealing surface material of ball valves, with good sealing performance, and they have also been widely used in vacuum systems.
4. Convenient operation and quick opening and closing. It only needs a 90° rotation from fully open to fully closed, which is convenient for remote control.
5. Convenient maintenance. The pneumatic ball valve has a simple structure, and the sealing ring is generally movable, making disassembly and replacement relatively easy.
6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, so the medium will not cause erosion to the sealing surfaces of the valve when passing through.
7. Wide application range. The diameter ranges from a few millimeters to several meters, and it can be applied from high vacuum to high pressure.

III. Installation:
1) Remove the protective covers on both sides of the flange end, and rinse and clean the valve when it is fully open.
2) Before installation, conduct a full machine test according to the specified signal (electric or pneumatic) (to prevent the impact of vibration during transportation on the performance). Only after passing the test can it be put into online installation (wiring should follow the wiring diagram of the electric actuator).
3) Before preparing to connect with the pipeline, it is necessary to rinse and remove the residual impurities in the pipeline (these substances 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) There should be no sagging or external force on the pipeline near the installation point. Pipe supports or brackets can be used to eliminate the deviation of the pipeline.
7) After connecting with the pipeline, please tighten the flange connection bolts crosswise with the specified torque.

IV. Operation and Use:
1) Before operation, confirm that the pipeline and valve have been rinsed.
2) The operation of the valve is completed by driving the valve stem to rotate according to the size of the input signal of the actuator: when rotating 1/4 turn (90°) in the forward direction, the valve is closed; when rotating 1/4 turn (90°) in the reverse direction, the valve is opened.
3) When the direction indicator arrow of the actuator is parallel to the pipeline, the valve is in the open state; when the indicator arrow is perpendicular to the pipeline, the valve is in the closed state.

V. Maintenance:
1) Regularly check whether there is rust, welding slag, dirt and dust in the pipeline.
2) Regularly check the supports, especially the brackets in places with large self-weight and vibration.
3) The air source must not have any faults.
4) The sealing gasket at the connection between the valve body and the upper valve cover needs to be replaced in time after long-term use. During replacement, just remove the upper valve cover to install a new sealing gasket.
5) If there is leakage in the packing gland, replace the sealing packing in time. During replacement, disconnect the valve stem, remove the pressure plate and packing gland, then install new packing.
6) Conduct regular maintenance.
7) When parked for a long time, install protective covers on the connecting flanges, and plug all interfaces with plastic plugs. During parking, ensure the overall vertical or horizontal position of the valve.
8) Do not support the valve on sensitive parts such as valve positioners, joints and connecting wires.