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Plastic valves are made from plastic materials and are used in applications that require corrosion resistance and/or chemical handling. They are made from acetal polymers, polyvinyl chloride (PVC), chlorinated PVC (CPVC), polytetrafluoroethylene (PTFE), polyethylene (PE), polypropylene (PP), and polyvinylidene fluoride (PVDF). Acetal polymers offer excellent lubricity, fatigue resistance, and chemical resistance. PVC provides good flexibility, smooth surfaces, and nontoxic qualities. CPVC is suitable for high temperature applications and is used in hot water distribution. PTFE exhibits a high degree of chemical resistance and a low coefficient of friction. PE is a soft, flexible and tough plastic with outstanding electrical properties but poor temperature resistance. It is prone to stress cracking and has poor resistance to ultraviolet (UV) light. PP is similar to PVC, but can be used in exposed applications because of its resistance to UV, weathering and ozone. PVDF has good wear resistance and excellent chemical resistance, but does not perform well at elevated temperatures.

There are many types of plastic valves. Ball valves provide tight shut-offs, but are not suitable for sanitary applications. Butterfly valves permit flow in only one direction. Check valves are self-actuating and prevent the reversal of process flow. Diaphragm valves separate the flow of gases from the closure element. Directional valves steer flow through selected passages. Diverter valves redirect process flow. Drain valves reduce surplus media. Float valves open or close automatically as the level of a fluid changes. Foot valves are check valves with a built-in strainer. Gate or knife valves are linear motion valves in which a closure element slides into the flow to shut off the stream. Globe and pinch valves are other types of linear motion devices. Needle valves have a slender, tapered point at the end of a valve stem. Poppet valves open and close ports with a sealing device and spring. Plug or stop-cock valves are designed for both on/off and throttling functions. Other types of plastic valves include sanitary or hygienic valves, sampling or dispensing valves, shut off valves, solenoid valves, and toggle valves.

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Products & Services Related to Plastic Valves
Butterfly Valves
Butterfly valves control flow through a circular disc or vane by turning the valve's pivot axis at right angles to the direction of flow in the pipe. They are normally used as throttling valves to control flow.
Check Valves
Check valves are self-activating safety valves that permit gases and liquids to flow in only one direction, preventing process flow from reversing. They are classified as one-way directional valves. 
Globe Valves
Globe valves are linear motion valves with rounded bodies, from which their name is derived.  They are widely used in industry to regulate fluid flow in both on/off and throttling service. 
Needle Valves
Needle valves are small valves used for flow control in liquid or gas services. The fine threading of the stem and the large seat area allow for precise resistance to flow.
Pinch Valves
Pinch valves includes any valve with a flexible elastomer body that can be pinched closed, cutting off flow, using a mechanism or fluid pressure.
Solenoid Valves
Solenoid valves are devices that use a solenoid to control valve activation.
Solids Valves
Solids valves are used to control or regulate the flow of powder, granular and other bulk solid materials along a process line, or to and from process units, storage bins, conveyors and product packaging.

Other Topics You Might Be Interested In
Acetal
Acetal polymers are semi-crystalline. They offer excellent inherent lubricity, fatigue resistance, and chemical resistance. Acetals suffer from outgassing problems at elevated temperatures, and are... (Read More)
Chapter 5: Manual Operators and Actuators: Section 5.1 - Introduction to Manual Operators and Actuators
5.1.1 Purpose of Manual Operators and Actuators With most valves, some mechanical device or external system must be devised to open or close the valve, or to change the position of the valve if it is... (Read More)
Chapter 5: Manual Operators and Actuators: Section 5.1.3 - Definition of Actuators and Actuation Systems
5.1.3 Definition of Actuators and Actuation Systems Automatic control of valves requires an actuator, which is defined as any device mounted on a valve that, in response to a signal, automatically... (Read More)

Engineering Web: Plastic Valves
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Plastic Valves
Plastic Valves Companies - 151 Products - 30 Plastic Valves Displaying 1-22 of Total 30 Products Found
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Plastic Ball Valves Manufacturers On B2BChinaSources.Com from...
Plastic Ball Valves China Plastic Ball Valves Manufacturers listings in full models and specifications.
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Part Numbers for Plastic Valves
Part # Distributor Manufacturer Product Category Description
91F1777 Newark Pactec Valves Hand Held Enclosure; Enclosure Material:Plastic; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes Rohs Compliant: Yes
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