Q611F Pneumatic Three-Piece Ball Valve

I. Introduction:

The Q611F pneumatic three-piece ball valve and butt-weld ball valve are divided into one-piece, two-piece and three-piece types. The valve body is cast using advanced technology introduced from Taiwan, featuring 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 internally threaded ball valve and butt-weld ball valve are suitable for various pipelines with PN1.0～4.0MPa and operating temperature of -29～180℃ (sealing ring is reinforced polytetrafluoroethylene) or -29～300℃ (sealing ring is polyphenylene sulfide), used to cut off or connect the medium in the pipeline. By selecting different materials, they can be respectively applied to various media such as water, steam, oil products, nitric acid, acetic acid, ammonia brine, and neutralized water.

II. Advantages:
1. Small fluid resistance, with its 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, ensuring good sealing performance, and they have also been widely used in vacuum systems.
4. Convenient operation and rapid opening and closing. It only needs a 90° rotation from fully open to fully closed, facilitating remote control.
5. Convenient maintenance. The pneumatic ball valve has a simple structure, and the sealing rings are 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 valve sealing surfaces 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 from both ends of the flange, and flush and clean the valve while it is fully open.
2) Before installation, conduct a full machine test according to the specified signal (electric or pneumatic) (to prevent performance impact from vibration during transportation). 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 to the pipeline, flush and remove residual impurities in the pipeline (these substances may damage the valve seat and ball).
4) During installation, 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 pipeline deviation.
7) After connecting to the pipeline, 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 flushed.
2) The valve is operated by rotating the valve stem driven by the input signal of the actuator: rotating 1/4 turn (90°) in the forward direction closes the valve; rotating 1/4 turn (90°) in the reverse direction opens the valve.
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 the pipeline for rust, welding slag, dirt and dust.
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, simply remove the upper valve cover to install a new sealing gasket.
5) If there is leakage in the packing box, 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 storing for a long time, install protective covers on the connecting flanges, and plug all interfaces with plastic plugs. During storage, keep the valve in an overall vertical or horizontal position.
8) Do not support the valve on sensitive parts such as valve positioners, joints and connecting wires.