Polypropylene and/or (PVDF) Valves: A Superior Choice for Chemical Applications

Four major factors should be considered when selecting the most functional and cost-effective valve for chemical applications. Be aware not to overlook these attributes during the planning and design process:

Engineers may disregard some, if not all, of these factors that affect not only efficiency and longevity of the individual part but the entire application’s level of performance. We examine how Polypropylene and PVDF valves rate in each of these category, detailing how these durable selections can lead to lower costs of total ownership and higher levels of lifetime functionality.

Material Selection

Polypropylene and or (PVDF) valves are composed of pure, non-toxic FDA grade materials. They impart no odors or tastes into the fluids that pass through, a crucial element to maintaining the liquid’s purity. Meanwhile the materials are highly resistant to corrosion, abrasion and strong chemicals, especially those of acidic nature. This results in a surface with a long-cycle life, a key factor for OEM’s (Original Equipment Manufacturers) seeking a durable product. For example, PVDFs have excellent resistance against some of the most erosive chemicals: 1) halogens, such as chlorine and bromine, 2) strong acids, such as nitric, 3) strong salts and alkalis, and 4) organic solvents and oils.*

In addition to handling anti-corrosion in typical temperatures and flow patterns, Polypropylene and PVDF valves, the standard inert materials used in Evsco’s valves and construction, can also withstand explosion proof rating actuation. The non-toxic FDA grade materials make them safe and suitable for chemical applications. Evsco also offers solutions that combine the valves with selected O-rings to suit custom designs.

*As a word of caution, not all PVDF is created equal. Evsco’s line of products conform with FDA grade ratings, the highest awarded, which allows its applications to take on aggressive services as well as higher purity choices.

Seal

Maintaining a seal on chemical applications is an absolute MUST, and the tighter the seal the better. The proper O-Ring will ensure full security from leaks that could significantly setback flow patterns. Manufacturers like Evsco offer choices for O-Rings, even custom designs to match particular applications.

An Interchangeable O-Ring functions best with a correct fitting to wetted PVDF or Polypropylene base valves. The combination guarantees service compatibility that customers will notice.

Flow

When it comes to flow, the broader the range of possible patterns, the easier the Engineer can manage design criteria for various or multiple applications. The more precise patterns allotted, the more likely a configuration will exist that is appropriate for the exact combinations of chemicals in the process. Evsco offers many, if not the most, diverse flow patterns in the industry.

If the application requires sequential actuated valves to run simultaneously in a system, reach for a ball-valve alternative. Evsco offers a Stack Valve system which makes it possible to operate two or more valves with one actuator to drive the lowest base actuation costs in the market. The Polypropylene or PVDF material maintains a consistent flow even in the stacked setup for multi-directional applications. Also consider electric or pneumatic actuators, which may serve best under varied types of continuous process conditions.

Maintenance and Serviceability

No matter how durable or functional the process, OEM’s must also consider the serviceability of the application. What is the downtime like for quick fixes and interruptions? Are the valves and other parts easily accessible in the application? Quick and easy operational maintenance stems from a smart, simple design and results in optimum performance and long service life. Valves made with Polypropylene or PVDF from Evsco’s line of products possess a compact design for easy placement and removal. In-Line service features allow for extensions on designs to better suit the applications needs.

The Right Valve, the Best Performance

Factoring in all four of these considerations during the design phase, the Polypropylene or PVDF valves prove strong candidates for chemical applications that service harsh or erosive chemicals, unique flow patterns, or require durability and easy maintenance. A simple choice of the right product from the start can lead to the most reliable performance over the course of the application’s lifetime.

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