Durabla

Durabla in-line check valves come from DFT Inc. (Durabla Fluid Technologies) of Exton, Pennsylvania, a company that began as Durabla Manufacturing Company in New York City in 1911. An in-line check valve passes flow one way and closes against reverse flow, and the wafer pattern sits between two flanges without a long body.

Six Durabla check valve styles are listed on BoilerSupplies.com: SCV, Basic Check, DLC, GLC, WLC and Excalibur, with the PDC listing for compressor service and Durabla vacuum breakers beside them. Each style is ordered by four things: line size, the flange class it sits between, body and trim material, and the service (steam, condensate, water or air). A Durabla vacuum breaker admits air into a line or vessel when the pressure inside drops below atmospheric, so a coil or tank does not collapse or hold condensate. It is ordered by the connection and the line it protects.

Key facts

• Durabla in-line check valves come from DFT Inc. (Durabla Fluid Technologies) of Exton, Pennsylvania.

• The company began as Durabla Manufacturing Company, founded in New York City in 1911.

• The Durabla Basic Check valve dates from 1940; the GLC, WLC, PDC, Excalibur, SCV and DLC followed between 1977 and 1996.

• BoilerSupplies.com lists the Durabla SCV, Basic Check, DLC, GLC, WLC and Excalibur check valves, the PDC listing for compressor service, and Durabla vacuum breakers.

• A Durabla in-line check valve is ordered by line size, flange class, body and trim material, and service.

• In-stock small-pack orders placed before 2:00 PM EST, Monday through Friday, ship the same day.

A silent check valve or a wafer check: is that a Durabla in-line check?

It is. Silent check valve, wafer check valve, in-line check, non-return valve and one-way valve are all trade names for the Durabla check valve family on BoilerSupplies.com. The wafer pattern sits between two flanges, so there is no long body and no swing arm. Go by the Durabla style on the old valve: SCV, DLC, GLC, WLC, Excalibur, Basic Check or PDC.

What do I need to give you to get the right Durabla check valve?

Read four things off the line: the pipe size, the flange class the valve sits between, the body and trim material, and the service: steam, condensate, feedwater, water or air. Add the Durabla style stamped on the old valve if it is still readable, and the count. A photo of the valve in place, tag side out, settles the rest.

Will a Durabla check valve stop water hammer on a pump discharge?

Sometimes, where a late-closing check is the cause. A check valve that closes late is one common cause of hammer on a pump discharge: the column reverses, then the disc slams. A silent in-line check valve is meant to close before the column reverses; hammer from trapped condensate or fast-closing valves needs a different fix. Match the line size, the flange class and the service.

Why put a Durabla vacuum breaker on a steam coil?

A Durabla vacuum breaker on a steam coil lets the coil drain after the steam shuts off. Steam left in the coil condenses, the pressure inside drops below atmospheric, and the condensate cannot get out against that vacuum. The coil then sits wet and hammers on the next start. The vacuum breaker admits air as the pressure drops, the vacuum clears, and the coil drains by gravity.

What is the Durabla PDC?

The Durabla PDC is the Durabla check valve listing on BoilerSupplies.com for compressor service. It is ordered like the other Durabla in-line check valves, by line size, flange class and body and trim material. Add that it is going on a compressor.

Pick up the phone at 1-770-957-9599, toll free 1-800-780-3776, with the line size, flange class, material, service and count ready, or put those five details in the request on BoilerSupplies.com.