Belef Pneumatic Actuator Co., Ltd. - 瑞力流体控制无锡有限公司

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Pneumatic Plastic Valves – Corrosion - Resistant Flow Control Solutions

Our Pneumatic Plastic Valves are engineered for precise, automated control of aggressive and high-purity fluids. Designed for reliability in corrosive environments, they feature PVDF, PP, or PVC bodies for superior chemical resistance, paired with robust aluminum alloy rack-and-pinion actuators for dependable operation. Easy to install and integrate into automated systems, they are the optimal choice for chemical, water treatment, and semiconductor applications.

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Product Overview

Pneumatic Plastic Valves – Corrosion-Resistant Quarter-Turn Automatic Control Valves

Our pneumatic plastic valves fall into the category of corrosion-resistant quarter-turn automatic control valves, with the mainstream product lineup consisting of two primary types: pneumatic plastic ball valves and pneumatic plastic butterfly valves.

Each complete unit comprises a pneumatic actuator, plastic valve body, valve stem, plastic sealing structure, and pneumatic control accessories. All wetted parts are manufactured entirely from plastic materials, completely eliminating the risks of rust, corrosion, scaling, and secondary contamination that arise from metal contact with the process media.

Common engineering plastic materials used in our pneumatic plastic valves include UPVC, CPVC, PPH, and PVDF – all of which feature the inherent stability of high-performance polymers. In contrast to cast iron or stainless steel valves, our plastic valves offer unparalleled corrosion resistance, making them the preferred choice for demanding chemical and fluid handling applications.

1. UPVC (Unplasticized Polyvinyl Chloride) Offering strong versatility and excellent cost-effectiveness, UPVC resists corrosion from acids, alkalis, salt spray, and wastewater. Suitable for normal-temperature, atmospheric-pressure applications involving conventional acid-alkali waste liquids, chemical wastewater, and water treatment pipelines, UPVC is the most widely used plastic valve material on the market. 2. CPVC (Chlorinated Polyvinyl Chloride) With superior heat resistance over UPVC, CPVC can withstand acid and alkali media at temperatures ranging from 70°C to 90°C. It is ideally suited for high-temperature wastewater and mildly corrosive hot fluid transfer applications. 3. PPH (Polypropylene Homopolymer – Modified) Featuring enhanced chemical resistance, PPH offers robust performance against strong acids, strong alkalis, and organic solvents, combined with high toughness and impact strength. It is the material of choice for demanding service conditions in fine chemicals, electroplating pickling lines, and chemical solution transfer systems. 4. PVDF (Polyvinylidene Fluoride) As a premium anti-corrosion material, PVDF provides exceptional resistance to strong oxidizers, strong acids, strong alkalis, and organic solvents. It also delivers excellent high-temperature tolerance, outstanding aging resistance, and food-grade purity, making it the ideal solution for pharmaceutical manufacturing, high-purity water treatment, and advanced fine chemical processes.

Product Features

In the industrial mainstream, pneumatic plastic valves are broadly divided into two major series: pneumatic plastic ball valves and pneumatic plastic butterfly valves. With distinct structural designs and complementary operating conditions, they cover the vast majority of corrosion-resistant pipeline applications. 1. Pneumatic Plastic Ball Valves Adopting a spherical sealing structure with a straight-through flow path, these valves offer large flow capacity, low flow resistance, and strong sealing performance, enabling zero-leakage shut-off. They are suitable for small-bore pipelines, high-pressure-drop conditions, and applications involving clean pharmaceutical liquids, concentrated acids, and alkalis. They feature rapid switching action, strong erosion resistance, and are not prone to sediment buildup or clogging. 2. Pneumatic Plastic Butterfly Valves Employing a rotating disc sealing mechanism, these valves feature a lightweight and compact structure, short face-to-face dimensions, and lower cost. They are suitable for large-bore ventilation, wastewater, exhaust gas, and low-corrosion high-flow pipelines. Their compact size saves installation space, making them the leading product for automated control of large-diameter corrosion-resistant piping.
The entire series of pneumatic plastic valves is equipped with standard rack-and-pinion pneumatic actuators, available in two types: double-acting (air-to-open/air-to-close) and single-acting (spring-return):

• Double-acting: Air supply controls both opening and closing. Stable and durable, suitable for conventional automated operating conditions； • Single-acting: Automatically returns to the closed or open position upon loss of air supply. Ideal for explosion-proof and safety emergency shut-off applications. They can be paired with a complete pneumatic control system, including solenoid valves, air filter-regulator-lubricator units, limit switch boxes, and pneumatic positioners, enabling automatic on-off control, remote start/stop, flow regulation, status feedback, and equipment interlocking – accurately interfacing with industrial automation systems.

Applicable Media

Pneumatic plastic valves are specifically engineered for corrosive media applications where metallic valves fall short: • Various acid and alkali wastewaters, chemical effluents, electroplating baths, and pickling solutions； • Seawater, brine, chlorinated water, and ionic corrosive fluids； • Exhaust gas ventilation and corrosive gas piping systems； • Pure water, deionized water, and pharmaceutical-grade clean fluids (with food-contact-compliant material options available)； • Mildly elevated temperatures, high-humidity environments, and high-salt-spray corrosive conditions. Not recommended for: High-pressure steam, extremely high temperatures, or heavily abrasive particle-laden media (for which metal hard-seated valves remain the preferred solution).

Application Fields

Pneumatic plastic valves are the standard choice for automated corrosion-resistant fluid handling systems, with applications spanning the full spectrum of anti-corrosion industries: • Environmental protection: wastewater treatment, reclaimed water reuse, and exhaust gas treatment equipment； • Chemical, fine chemical, electroplating, and pickling production lines； • Pharmaceutical, food and beverage, pure water systems, and swimming pool water treatment facilities； • Metallurgical desulfurization, landfill leachate treatment, and salt industry conveying； • Complete automation equipment packages and anti-corrosion pipeline engineering projects.