What are Diaphragm Valves used for?

The Diaphragm valves are primarily used in applications that require tight shut-off, accurate closure and is effective in gas, liquid, suspended solids and slurry applications. Diaphragm valve is also ideal for acidic, corrosive and abrasive applications with the proper materials and linings.

What are Diaphragm Valves?

Diaphragm Valves are glandless valves that consist of a valve body, a flexible elastomeric diaphragm, and a seat (Weir/Saddle/seat) upon which the diaphragm closes the valve.

In addition, diaphragm valves provide an external seal, therefore all moving parts are fully isolated from the wetted parts and the media being conveyed. A fully functioning elastomeric diaphragm seals leak-tight against the valve body, completely isolating all the mechanical working parts of the valve’s operating mechanism from the fluid. This total separation between the media passing through the valve and the bonnet also eliminates troublesome stem seal and packing gland problems as well as providing fugitive emission protection.

Diaphragm valves are typically available in two configurations, straight-through and weir type.

Straight-Through Valve

This type of diaphragm valve is also often referred to as full bore diaphragm valve. In this design, the diaphragm seals over a seat. Due to their unique design, these valves provide full flow capability with minimum pressure drop. These valves are typically applied for on-off service.

Tru-Tech Valve’s straight-through design provides self draining capability by incorporating a slightly raised seat. This design provides the same leak tight capabilities of other diaphragm valve design and in addition provides a self-draining capability not found in competitive designs.

Weir Diaphragm Valve

In this type of diaphragm valve, the diaphragm seals against a Weir or Saddle. These valves are typically applied in throttling control applications. The Tru-Tech enhanced weir design provides for a more laminar flow pattern compared to the traditional weir design thereby minimizing pressure drop.