All brands of diaphragm valves have common design features that are unavailable in other type valves. These unique advantages include in-line maintenance, positive bubble-tight closure, bonnet isolation, no packing glands, and a streamlined flow passage without recesses or pockets.

A pliable rubber diaphragm seals leak-tight against the valve body and at the same time completely isolates 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.

A wide range of rubber and plastic body linings and diaphragm materials provides a cost-effective solution to readily handling corrosive and abrasive liquids as well as liquids with suspended solids.

Providing simplified in-line maintenance has become increasingly more important in valve selection. All sizes and types of diaphragm valves provide this important feature.

Diaphragm valves don't seize up like eccentric plug valves and are excellent for replacing problem valves in the field.

TO SELECT THE PROPER DIAPHRAGM VALVE FOR YOUR APPLICATION THE FOLLOWING QUESTIONS MUST BE ADDRESSED:

1. SERVICE CONDITIONS? What is the fluid being handled? It could be hydrochloric acid, tap water or something in between. Note also that it could be a combination of two or more things.

2. CONCENTRATION OF FLOWING FLUID? The concentration affects the proper choice of body lining and diaphragm material.

3. SYSTEM OPERATING TEMPERATURE? Many chemicals are more aggressive at elevated temperatures. Plus, body linings and diaphragm materials are pressure/temperature rated.

4. SYSTEM OPERATING PRESSURE? Most diaphragm valves are pressure limited. Consult manufacturers recommendations for system compatibility.