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  • Excess Flow Valves

Hemco's Excess Flow Check Valve provides instant shutoff­ in the event of a hose break or line failure, preventing the release of hazardous or in‑flammable products to the area which can result in a disastrous fire or explosion and untold damage to personnel and equipment. When a line fails, an excessive amount of product is released in a matter of seconds. The Hemco Excess Flow Check Valve protects against instances where the operator is unable to reach the shut-off­ due to either injury, or the whipping action of the hose. Once a leak is repaired the pressure in this system will automatically equalize across the valve and the valve will be ready for service without any maintenance required. Take the guess-work out of this situation with automation.

All LPG tank cars, LNG tank cars and Butane tank cars, chemical transport trucks, and loading/unloading stations are required by both state and federal regulatory bodies to have Excess Flow Check Valves installed. In addition, all LPG, LNG, Butane storage vessels used for domestic delivery and consumption are also required to have Excess Flow Valves installed.

excess flow values download brochure

Standard Features

  • Available in 2”, 3” and 4”
  • Welded steel construction
  • Flow limit capacity ranges from
  • 5,000 to 6,000 GPH
  • A-105 forged steel ‑flanges and seamless cold drawn A-106 tubing
  • Immediate shutoff­ response in the event of hose break or line failure

Operation - Automatic

Hemco Excess Flow Check Valves are specifically designed to permit high flow, yet close instantly and automatically when the flow becomes excessive due to line failure or other reasons. Liquid can flow through the valve in either direction however; the flow will be shut off in the direction indicated on the drawing in the event the volume through the check valve exceeds the predetermined customer-specified limit.

Construction - Rugged

The Hemco Excess Flow Check Valve body is of all welded steel construction consisting of A-105 forged steel flanges and seamless cold drawn A-106 tubing, seal welded and hydrostatically tested at 750 PSI. Internal parts are of special steels and stainless steels to insure trouble free operation for a very long period of time.

Installation - Simple

Hemco Excess Flow Check Valves may be installed in any size line up to 4", horizontally, or vertically, with flow in either direction.

Hemco proudly offers an industry leading 5-year warranty on our galvanized carbon steel products.

Get a FREE quote on the Hemco Excess Flow Check Valve, just fill out the Request A Quote form and a product specialist will contact you shortly. You can always reach us by phone at 713-681-2426 or toll free at 877-394-3626.