Elastomer Hinged Butterfly Check Valves

Butterfly Check Valves with Elastomer Hinge for the Lowest Pressure Drop

US Valve's butterfly check valve with Elastomer-Hinge Design is the key to providing the lowest pressure drops in the industry. It takes performance to an entirely new level by eliminating the restrictive valve seat and substantially increasing the valve’s open area and flow coefficient (Cv). The elastomer  provides positive sealing and has long life (see "Elastomer Properties" table below to select the proper elastomer for your application).

Butterfly Check Valves

Butterfly check valves with Elastomer Hinge - face down

Full Port Butterfly Check Valves provide more flow and lower pressure drops than conventional check valves. 

Process Compatibility for Butterfly Check Valves

Elastomers for butterfly check valve hinges must be selected with process constituents, temperature range and other variables in mind to insure long life and reliability. The following selection chart shows elastomer compatibility for many common chemicals.

Elastomer Properties

DescriptionBuna-N
(Nitrile NBR)
Viton
(Fluoro Carbon)
EPDM
(EPDM Nordel)
Silicon
(Silastic)
Teflon
(PTFE)
*Temperature Limits (°F) -60 to 225 -20 to 400 -40 to 300 -100 to 500 -20 to 450
**Reinforcement Material Nylon  Nomex Nylon Fiberglass None
Major Attributes Oil & gas resistant, also air and water service Oil and gas resistant, air and water service, and heat, solvent and chemical resistant Water, steam and condensate use, general purpose High temperature air service Resistance to most chemicals
Diluted Acid Good Excellent Excellent Fair Excellent
Concentrated Acid Good Excellent Good Fair Excellent
Aliphatic hydrocarbons Excellent Excellent Poor Poor Excellent
Aromatic hydrocarbons Good Excellent Poor Poor Excellent
Oxygenated keytones Poor Poor Good Fair Excellent
Lacquer Solvents Fair Poor Good Poor Excellent
Oil swell Very Good Excellent Poor Fair Excellent
Oil and gasoline Excellent Excellent Poor Fair Excellent
Animal/vegetable oils Excellent Excellent Good Fair Excellent
Water absorption Fair to Good Very Good Excellent Good Excellent
Oxidation Good Excellent Excellent Excellent Excellent
Ozone Fair Excellent Excellent Excellent Excellent
Sunlight Poor Very Good Very Good Excellent Excellent
Heat Very Good Excellent Excellent Excellent Excellent
Do NOT use on: Acetone, Methyl Ethyl Ketone and Keytones Oils/Hydrocarbon fluids Water, steam, oils Zero leakage requirements

*Note: Temperature limits are for intermittent exposure, not for continuous duty
**Note: Reinforcement material is used only in our Elastomer Hinged Valves

Complete Engineering Data

Engineering data, including available Elastomers, is available in our individual product brochures which can be accessed from the specific valve page you are visiting or directly from the Engineering Resources page.

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