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Plastic-Lined Valves

Resistoflex Plastic-Lined Valves have field proven performance features

Handling corrosive or hazardous chemicals is the wrong place to settle for second best. Valve failure can be a nightmare. Leaks can damage surrouding equipment, requiring expensive replacement and downtime. Worse yet is the exposure risk to your personnel if the valve fails to contain the fluid.

We have been in the plastic-lined valve business since 1948 and can help with your fluid control problems.

Combine the corrosion resistance of plastic with the strength of metal

Resistoflex Plastic-Lined Valves combine the best properties of two different materials of construction. On the outside, a metal body provides strength, shock resistance, ease of installation, and a high pressure handling capability.

On the inside, a plastic lining offers corrosion resistance even stainless steel and high alloy metal valves can’t match, at a cost that is usually lower. The thick plastic lining also prevents contamination of high purity fluids.

Handling almost any corrosion

With one of four different plastic liners, Resistoflex Plastic-Lined Valves will handle a wide variety of corrosives, at temperatures from -20°F to 350°F (-28°C to 149°C). That includes acids, caustics, oxidants, reducing agents, waste streams, salt solutions, slurries, organics, and many, many other fluids. Resistoflex valves are used where protection is needed against system failure, particularly when sudden leakage and spillage of dangerous or toxic fluids can cause environmental damage or injure operating personnel.

Protect stream purity

In addition to corrosive handling, Resistoflex Plastic-Lined Valves are used in processes where maintaining stream purity is vital, such as the handling of food and pharmaceutical products. They’re widely used to prevent metallic ion contamination in demineralized water systems for stream and power generation.

Thick, quality liners

Section a Resistoflex Plastic-Lined Valve in half and you’ll see not only a thick plastic liner, but one with closely controlled thickness throughout. Our manufacturing process is carefully controlled to assure that liners will not thin out around sharp corners or in deep draws. Our thick liners are superior in ability to withstand thermal cycling, mechanical shock, and permeation by corrosives - problems that can cause failures in valves with thinner lines.

An unusually rigorous program of 100% valve testing

Liner resins, castings, and component parts are sampled to ensure compliance with Resistoflex specifications. But we don’t stop with just these random checks.

Each and every valve shipped to you by Resistoflex is tested in 3 different ways, in accordance with ANSI B16.34, MSS SP-61, and MSS SP-88.

First, each vavle’s liner is spark-tested at 15,000 volts d.c. to assure liner integrity. Second, it is hydrostatically shell-tested at 1.5 times the 100°F pressure rating of the valve. Third, it is pneumatically seat-tested for leakage with 80 psi air pressures in one direction for check valves and in both directions for diaphragm valves. We think that’s as tough and comprehensive a series of production tests as you’ll find anywhere in the industry.

In addition, all dimensions are in accordance with ANSI B16.42 (ductile iron) and ANSI B16.5 (steel).

Professional service and support

Whether you’re working on a new project or a retrofit job, you probably have our hands full. We recognize the need for personal technical support. Here are just a few of the support services Resistoflex offers.
  • Assistance in selecting the right plastic-lined valves for your application based on fluid concentration, temperature, and pressure.
  • Bill of materials and isometric drawings for pipe and valve installation – even field verification.
  • Scheduling of pipe and valve delivery to coincide with your project phases.
  • On-site training fabrication and installation.

Valve Figure Number Cross Reference

From time to time, older specifications reference a "Dow Figure Number" for certain Resistoflex valves, which prior to 1999, were manufactured and sold by Dow Plastic-Lined Piping Products. This obsolete numbering system refers to the type of Resistoflex valve.

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