Views: 142 Author: Site Editor Publish Time: 2021-02-08 Origin: Site
The higher the quality of the air-operated pinch valve inner bushing, the longer the service life of the pinch valve and inner bushing. The long service life of the inner sleeve of the pinch valve means that the maintenance cost of the equipment is low. The replacement of the inner bushing of the air pinch valve is very simple. With the help of detailed installation instructions, the replacement work can be carried out at the user's work site, so that only a short downtime is required. The inner sleeve of the pinch valve adopts different structures according to the pneumatic or mechanical type of the pinch valve, and the valve body also has a different structure.
The inner bushings of pneumatic or mechanical pinch valves are produced by different manufacturing processes. The manufacturing process for producing the inner sleeve of the pinch valve includes a manual traditional process, a conventional casting process, or a manual assembly process. The structure of the inner sleeve of the pinch valve has a great influence on its operating frequency, closing, and opening characteristics.
The inner sleeve of the pinch valve is made of elastomers of different qualities, so the service life, application range, and temperature environment of the pinch valve are different. Among them, the quality of the elastomer has a decisive influence on the service life and wear resistance of the inner sleeve of the pinch valve.
The use of elastomers with different Shore hardnesses can produce pneumatic pinch valve inner bushes with different pressure differences. The best control of the inner bushing of the pneumatic pinch valve can greatly increase the service life of the pneumatic pinch valve. Similarly, the optimal pressure difference and the setting of the control pressure for the inner sleeve of the pneumatic pinch valve also have a great influence on its service life.
The raw material of the inner liner is made of all-quality elastomer and standard wear-resistant natural rubber. The latter is suitable for a variety of bulk materials, with a temperature of up to 80°C. And natural rubber suitable for food safety can also be selected at a temperature of 90°C. The inner bushing of the V/VF/VA/VMP series pinch valve can also be made of nitrile rubber (Nitril or NBR), fluoro rubber (Viton or FPM), silicone resin, neoprene rubber (Neoprene), chlorosulfonated polyethylene rubber (CSM), and butyl rubber (Butyl, IIR) are produced as raw materials. Among them, EPDM and Nitril rubber can also be supplied with food-safe quality standards.
In order to meet the needs of users with different standards, the inner sleeve of the pinch valve can also be produced with high-quality elastomer and high-elastic braid lining. In order to ensure the longest service life and the maximum operating frequency of the inner bushings of the pinch valve, the inner bushings are often produced with multi-layer braid linings. In order to ensure the quality, the production of the inner bushing for the air pinch valve still retains part of the complicated manual manufacturing process. For 15 years, China JIANAI has been continuously expanding and perfecting the complicated manual production process of pinch valve inner bushings. The company regularly conducts continuous load tests on the inner bushing to ensure the product quality and service life of the inner bushing of the pinch valve. In addition, the realization of the optimal control of the inner bushing can greatly increase its service life, and even extend it several times.
The inner sleeve material of the standard conductive pinch valve is elastic high-quality natural rubber. Pinch valve inner bushings of almost all materials can be used for bulk material transportation at a temperature of about 80°C. There is also a material such as conductive nitrile rubber (NBR) that can be used for fat and oily media. High-temperature resistant materials can choose EPDM material with a temperature of 120°C. Conductive EPDM rubber and nitrile rubber (NBR) are both elastic and high-quality rubbers that meet food-grade requirements.
The inner sleeve material for the conductive pinch valve is composed of high-elastic fabric and high-quality elastomer, and the conductivity is >1000000 Ohm. Each conductive lining material uses a dedicated calibration and measurement device to measure resistance at multiple points.
The inner bushing of the OV series pinch valve is manufactured by the casting process. The opening of the inner liner of the OV series pinch valve is completed by the internal opening aid device. The device is directly installed in the pinch valve to ensure the opening of the pinch valve. The lining material of the OV series pinch valve is high-quality elastomer natural rubber, which can be used in almost all non-corrosive media, and can withstand temperatures up to 80°C. In addition, EPDM and neoprene are also available.
VZ series pipe pinch valve inner bushings are often made of full-quality elastomer standard natural rubber, and ethylene propylene diene rubber (EPDM), nitrile rubber (Nitril), and neoprene rubber (Neoprene) can also be selected. The VZ series inner liner for the air pinch valve is manufactured with high-quality elastomer and high-elastic braid lining. In order to ensure the reliable opening of the VZ inner liner, the inner liner is equipped with a standard opening piece.
The characteristic of this series of pinch valve inner bushings is the use of a patented extension shaft. Because the extension shaft can effectively compensate for large tensile and bending forces, the RVA series pinch valve conforming to DIN 3205, ASME B16, or ISO 5752 has a very short structural length.
In addition to the standard and all-quality elastomer natural rubber as the raw material of the pinch valve inner bushing, EPDM, Nitril, Butyl, and neoprene ( Neoprene), Viton (Viton), and silicone resin. Among them, EPDM and Nitrile rubber can also be supplied in accordance with food safety grade quality standards.
RVA series pinch valve inner bushing adopts the production process of high-quality elastomer and high-elastic braid lining. In order to ensure the reliable opening of the inner sleeve of the RVA series pinch valve, an opening piece is equipped in the inner sleeve. In addition to the structure with standard nominal diameter, the inner bushing of the RVA series pinch valve can also adopt a cone or double-sided cone structure. With this structure, it is easier to adjust the medium flow rate for special applications. In addition, a vulcanized monitoring wire can also be used as a wear warning system. The monitoring wire measures the volume resistance, and if the circulation is interrupted, an alarm signal will be issued.
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