Monday, January 20, 2020

Pinch Valves: An Outstanding Choice for Erosive and Abrasive Flow Conditions

Pinch Valves

Pinch valves are designed and constructed to outlast other types of valves in high wear applications. They are ideal where shut-off and control applications involve abrasive or corrosive slurries, powders or coarse substances.


In the open position, the valve is full bore with no flow restrictions. During closing, two pinch bars squeeze the valve sleeve shut on the centerline. Bubble tight shut-off is provided even if solids have built up on the sleeve wall. The rubber sleeve is the only wearing part which significantly reduces maintenance costs and extends service

Pinch Valve OperationPinch valves can be either shut off valves (also known as isolation valves) or control valves, and provide superior performance in the most demanding applications, where conventional valves encounter problems with wear due to increased turbulence. When the controlled flow is abrasive, it is a big advantage to have only one, wear resistant, valve part in contact with the medium. Because of this, the need for maintenance and spare parts is greatly reduced.

As the valves are self-cleaning, even if any solids are accumulated in the sleeve wall, it breaks away when the valve is operated. This is due to the flexibility of the sleeve, making the valve lifetime longer than many other competing products on the market. The sleeve is naturally wear resistant and when particles hit the sleeve’s rubber surface, the energy is absorbed and released when the rubber bounces back.
Pinch Valve Advantages

Strongly consider the use of a pinch valve to retrofit or replace the failing ball, butterfly, or gate valve in your application. Most plant maintenance and engineering staff will tell you they are very pleased with the decision.

For more information on the many uses and applications of pinch valves, contact Automatic Controls of Virginia. They can be reached by calling (804) 752-1000 or visit their web site at

Monday, December 23, 2019

Happy Holidays from Automatic Controls of Virginia

"This is my wish for you: peace of mind, prosperity through the year, happiness that multiplies, health for you and yours, fun around every corner, energy to chase your dreams, joy to fill your holidays!"  D.M. Dellinger

Saturday, December 14, 2019

The Val-Matic Quadrosphere Forged Ball Valve Ring Master Seating

The Val-Matic Quadrosphere forged ball valve is a proven unique trunnion mounted ball valve design for long life in numerous industrial applications where fluids with sediment tends to clog and damage traditional ball valves. The ball is not spherical, as in a typical ball valve. Surfaces of the ball are contoured with recessed surfaces on four sides of the ball. The contoured recess surfaces provide for extra flow paths and also provide lift edges that wipe the body seat clean during opening and closing. The hard chrome plated stainless steel ball provides low friction and abrasion resistance. The recessed surfaces provide multiple flow paths for particulates to be flushed from the body during every operation, thereby providing a self-cleaning valve.

The valve is equipped with a seat on both ends to provide bi-directional seating. The seating is available in double block and bleed (DBB) or double isolation and bleed (DIB) depending on the application. As with all trunnion mounted ball valves, when line pressure is applied to the valve, fluid flows behind the seat ring and presses the seat ring and resilient seal insert against the ball to make a tight seal. The ball is directly anchored to the body by rigid trunnions. The ball will rotate 90 degrees during opening and closing but the trunnions prevent any axial motion of the ball during pressurization. The valve stem is equipped with a shoulder to prevent blowout during process operations. The stem is sealed with o-rings and graphite packing for low fugitive emissions and fire safe applications. An emergency injection fitting is provided for emergency sealing until maintenance can be performed. 

For applications like geothermal fluid where scale and sediment are present in high concentrations, the optional ring master seat is used. The ring master uses an external pressure source such as grease or gas to press the seat to insert against the ball. Since the injection pressure is greater than the line pressure, the seat ring pocket is always isolated from the process fluid and cannot collect sediment over time. One method of applying external pressure to the seat is with a pressurized accumulator assembly. Grease or other compatible fluid is injected into the valve and the assembly until the seating pressures slightly higher than the process pressure is achieved. The pre-charged accumulator maintains the proper seating pressure over time. 

The Quadrosphere is available in sizes 2 to 24 inches and ansi pressure classes to 2500. The valves are manufactured in accordance with industry ball valve standards API 6d and 608. The valves have also been certified to fire safe and fugitive emissions standards. 

For more information, contact Automatic Controls of Virginia. Call them at (804) 752-1000 of visit their web site at

Tuesday, November 12, 2019

Understanding the Effects of Air in Pipelines

Air in Pipelines
Download White Paper Here

White Paper Courtesy of Val-Matic

The presence of air in a pipeline and its impact on operations is probably one of the most misunderstood phenomena in our industry today. Many operational problems are blamed on inadequate thrust blocking, improper pipeline bedding, etc. These problems include broken pumps, valves and pipe, as well as faulty instrumentation readings. In reality, many of these problems are not caused by improper installation of the equipment but by failure to de-aerate the pipeline. It has been said that if a pipeline is properly de-aerated, you can't guarantee against a line break. However, if you don't properly de-aerate a pipeline, you should be prepared for one.

For more information, contact Automatic Controls of Virginia. Visit or call (804) 752-1000.

Monday, November 11, 2019

Automatic Controls of Virginia Salutes Our Veterans

Veterans Day

Veterans Day is set aside to honor the men and women who have sacrificed so much in order to serve in the armed forces of the United States.

Veterans Day celebrates and thanks all United States military veterans,  alive or dead, and honors the sacrifices that they have made. Our Veterans are our neighbors, friends, family, and co-workers. They took an oath to defend the United States and our Constitution, from all enemies, foreign and domestic. We must never forget their bravery, service, and sacrifice.

Originally called Armistice Day because of the November 11 Armistice that ended World War I, its name was officially changed in the United States in 1954 to Veterans Day to include Veterans of all wars.

Through the observance of Veterans Day, we remind ourselves of our Veterans patriotism, love of country and willingness to serve and sacrifice for the common good.

Automatic Controls of Virginia celebrates and honors America's veterans.

Tuesday, October 22, 2019

Installation Manual for Waterman Sluice Gate Valves, Fabricated Gate Valves, Drainage Gate Valves, and Specialty Gate Valves

Waterman Industries is a leading provider of Sluice gate, Slide gates, Penstocks, Flap gate, Channel gate, Sluice Gate Valve, Gate Manufacturer, Stop logs, Aluminum Gates, Weir gate, Roller gate, Gate valve, Mud Valve, Flap valve, Butterfly Gate, Radial gate. for water treatment, wastewater, high-volume agricultural and rural surface water delivery, hydro-power, and flood control management.


  • Heavy Duty Sluice Gate Installation Instructions
  • Medium & Light Duty Sluice Gate Installation Instructions
  • Fabricated Slide Gate Installation Instructions
  • Drainage (Flap)(tide) Gate Installation Instructions
  • Specialty Products Installation Instructions

310 Hill Carter Parkway
Suite A
Ashland, VA 23005
Phone: 804-752-1000
Fax: 804-752-1030