AuthorVRC Protx

Join Us for Our Open House – June 19

  • Posted On June 4, 2015
  • Categorized In Blog
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New Location - Blog

The VRC Protx service team combines the expertise of our Engineers, Quality Control Foremen and Technicians who are dedicated in maintaining industry leading process safety with both shop and on-site technical service. Our core technologies are pressure relief valves, control valves and valve automation. Additional technical service technologies include instrumentation, in-line valve repair and electric motor operated valves; providing services for the power, petrochemical, refining, gas transmission & production, mining and all other process industries. Come see these capabilities as well as key products from our channel partners!

View our new location, see our equipment and discuss our capabilities with our local experts.

Areas of interest
Biffi electrics actuator on gate valves
Morin pneumatic actuator on ball valve with westlock and asco solenoid
Morin with PMV positioner on a KTM control valve
Morin electo-hydraulic (fail safe electric)
Vanessa Valve (actuated demo)

See our machine shop and assembly capabilities, boiler room, test stands and clean room… all will be open for you to see

Explosion Protection Terminology


In explosion protection of enclosures, Pred and Pes are two terms that often are used interchangeably, but are not the same thing. Pred, or “reduced pressure,” is the maximum pressure developed within an enclosure during a vented deflagration. Pes is the enclosure strength. Pes is defined as 2/3 of the enclosure’s ultimate strength if deformation of the enclosure can be tolerated or 2/3 of the enclosure’s yield strength if deformation cannot be tolerated.

When calculating the required vent area for an enclosure, NFPA standards state that Pred cannot exceed Pes (as defined above). When performing our calculations, we set Pred equal to Pes in order to minimize our vent size, and that leads to confusion of the terms. Also, many enclosure manufacturers will state a “Pred” for the enclosure, when they really should refer to Pes, or an “allowable” Pred. Pes must be provided for explosion protection design.

Pred vs. Pes is illustrated below, with Pstat being the explosion vent’s burst pressure, and Pmax being the max pressure of the burning dust in a vessel as determined by the ASTM E1226 dust test. If we can keep Pred below Pes, the enclosure won’t explode. Please note: During a suppressed deflagration, “Total Suppressed Pressure” replaces Pred in the illustration, but the idea is identical. Keep TSP below Pes and the enclosure won’t explode.


Kunkle Valves

  • Posted On February 6, 2015
  • Categorized In Blog
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As a Local Representative for Kunkle safety and relief valve products, VRC Protx promises to be your full-service flow and process safety management partner that keeps equipment and processes operating and safe. VRC Protx has a ready supply of Kunkle product on hand at factory direct pricing.

Kunkle Valves is a leading manufacturer of quality safety and relief valve products for industrial and commercial applications, including steam, air, liquid (including cryogenics) and non-hazardous gases. Their products are available for ASME Section I, Section IV and Section VIII services with relief capacities certified by the National Board. In addition, they offer a range of non-code products and each valve, both code and non-code is set, tested, and retested to the customer’s specifications and then sealed to prevent tampering.

Kunkle safety and relief valve products range in size from 1/4-inch NPT through 6-inch flange and are suitable for services ranging from cryogenic to 850°F at set pressures ranging from vacuum to 6,500 psig. They are available in a wide range of materials including Brass, Bronze, Carbon Steel, Stainless Steel, Cast Iron, and Aluminum.

Riley Valve Services becomes VRC

  • Posted On November 24, 2014
  • Categorized In Blog
  • Written By

As we head out of the “Great Recession” into a New Year, I would like to thank you for your business and announce our new name. Effective January 1st, Riley Valve Services becomes VRC Protx.

In 1997, the Dale Prentice Company, a privately held family business since 1926, purchased the D.E. Riley and Riley Valve Services companies from Don Riley. The business has continued to grow and our new name reflects a transformation to a higher level of performance and a combination of four technical product and service businesses serving the Great Lakes Region.

Riley Valve Services, Engineered Resources, Valve Repair Consultants and Industrial Instruments will be combined to form VRC Protx and will be represented in the Great Lakes by the Dale Prentice Company. The new service team combines the local support of the Sales Consultants and Customer Service contacts that you work with today and the expertise of all our Engineers, Quality Control Foremen and Technicians who are dedicated in maintaining industry leading process safety with shop and on-site technical service.

Our promise is to be your full-service flow and process safety management partner that keeps equipment and processes operating and safe. VRC Protx works to understand and anticipate your needs reducing downtime. As critical service application experts, we solve problems safety and effectively, advocating for our customers at global manufacturing leaders. Through knowledgeable people, quality products and innovative solutions, VRC Protx responds quickly to challenges, making your life easier. If you have any questions or comments, please contact your sales representative or click on the “Contact Us” link in the Quick Links section of this email.

Thank you for your support and business.

Have a Happy and Safe New Year!

Larry Prentice, VRC Protx