PVC or ABS Stone Color Edge Banding Series include that: The simulation designs of stone grains. We so the same color as customer panel.
We mainly supply customize color and size as per request. Size ranges 0.35-3.0mm thick and 12-620mm width. We adopt high quality PVC and ABS resin, Germany exported ink and UV. Strict quality control system to keep the quality of Pvc Edge Banding. Free samples for test. We also supply PVC edge banding, ABS Edge Banding, Acrylic edge banding, Aluminum Edge Banding, PP edge banding and Profile edge banding. We promise to only offer high quality edge banding.
Marbling Color,Stone Color,Pvc Stone Colors Sinowolf Plastic Dekor Co., Ltd , http://www.sinowolfdekor.com
Pneumatic control valve mainly includes pneumatic linear stroke control valve, pneumatic angle stroke control valve, pneumatic linear stroke cut-off valve and gas (liquid) dynamic angle stroke cut-off valve. Their correct installation is just as important as the right choice. The quality of the installation is a top priority in terms of operational performance, safety, and cost. The regulating valve must be installed strictly in accordance with the process requirements and the control system requirements. Once the valve fails, it will result in serious accidents such as fire, explosion, poisoning and personal injury. The loss cannot be calculated. Therefore, it cannot be taken lightly.
1, check before installation
Before installing the regulating valve, the product quality of the regulating valve should be inspected. From the appearance inspection, the parts and accessories are checked for loss, certificate of conformity, and if necessary, static characteristics or special inspections are required.
2, the installation principle
(1) The installation position of the pneumatic control valve requires a certain height from the ground. There must be some space above and below the valve for the disassembly and repair of the valve. For regulating valves equipped with pneumatic valve positioners and handwheels, operation, observation and adjustment must be ensured.
(2) The regulating valve should be installed on the horizontal pipeline and up and down the pipeline. It should be supported under the valve to ensure stability and reliability. For special occasions, when the regulator valve needs to be installed horizontally on a vertical pipe, the regulator valve should also be supported (except for the small-diameter regulator valve). When installing, it is necessary to avoid additional stress on the regulating valve, such as non-parallel or non-parallel pipe and valve.
(3) The working environment temperature of the regulating valve should be at (-30～+60)°C and the relative humidity is not more than 95%. Because rubber parts such as membranes and seal rings of regulating valves are easy to be hardened and brittle at a low temperature and aged at a high temperature, installation positions should be paid attention to during installation, and heating furnaces and high-temperature pipes should be left.
(4) There should be a straight pipe section in the forward and backward position of the valve, and the length of the pipe that is not less than 10 times the straight pipe length before and after the valve (10D) to prevent the straight pipe section of the valve from being too short and affecting the flow characteristics.
(5) When the diameter of the regulating valve is different from the process piping, the different-diameter pipe connection should be adopted. When the small diameter control valve is installed, it can be threaded. The fluid direction arrow on the valve body should be consistent with the fluid direction.
(6) Set bypass piping. The purpose is to facilitate switching or manual operation, and the valve can be serviced without stopping.
(7) Before the installation of the regulating valve, it is necessary to completely remove the foreign matter in the pipeline, such as dirt, welding slag, etc. After installation, the test run is performed with normal temperature water. During the test run, the valve shall be fully opened or the bypass valve shall be opened. During the test run, attention should be paid to the sealing of the connection between the valve body and the pipe.
3, installation form
The installation of regulating valves usually has a regulating valve group, ie upstream valve, bypass valve, downstream valve and regulating valve. It should be noted that the installation of shut-off valve (upstream valve, downstream valve) and bypass valve is close to the three-way valve. To reduce dead ends.
4, the choice of control valve installation position
Normally, the regulating valve requires vertical installation. When the vertical installation cannot be satisfied, the four-bolt regulating valve may have four positions of upward inclination of 45°, downward inclination of 45°, horizontal mounting, and downward vertical mounting. The 8 bolted regulators can have 9 mounting positions separated by 22.5°.
In these installation positions, the most ideal is to install vertically upwards, which should be preferred; the upwardly inclined position is secondarily followed by 22.5°, 45°, and 67.5°; the downward vertical installation is the re-position; the worst position is horizontal For installation, it is inclined to 67.5° with a nearly horizontal installation, generally not adopted.
5, the maintenance of the valve
Due to the harsh environment of use of regulating valves, certain failures are inevitable during use. Therefore, it is necessary to perform certain maintenance and maintenance of the regulating valve. The main contents of daily maintenance of pneumatic control valve should have the following items:
(1) Valve body wall. Check its pressure and corrosion resistance.
(2) Seat. Due to medium infiltration, the inner surface of the thread used to fix the valve seat is susceptible to corrosion and the valve seat is loosened. Care should be taken during inspection. For high pressure applications, also check that the valve seat sealing surface is damaged.
(3) Spool. It is necessary to carefully inspect whether the various parts of the spool are corroded or worn, especially if the valve core wears more seriously under high differential pressure, and care should be taken. In addition, it should also check whether the stem has a similar phenomenon, or loose connection with the spool.
(4) Diaphragms, o-rings, and other seals. Check for aging and cracking.
(5) Sealing packing. Check whether the PTFE packing, seal grease is aging, dry, and whether the mating surface is damaged.