Liquid End Designs

Mechanically Actuated Diaphragm Design

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he Milton Roy Family of mechanically-actuated diaphragm pump is called the MacRoy Series G. They represent the best balance between low pump cost and high quality performance. Because it has zero diaphragm leakage, it makes a great pump for critical and otherwise expensive chemicals or where envi-ronmental issues are involved. The mechanically-actuated series is an excellent choice where slurries and abrasive chemicals are required up to the pump's maximum flow and pressure ranges. They are also well tolerant of high viscosity liquids providing an economical solution for a variety of difficult applications. Mechanically-actuated pumps operate with a plunger directly attached to the diaphragm. This attachment generally takes place from a bolt and clamp being placed through the plunger and through the diaphragm. The direct attachment of the piston to the diaphragm connects the pump's drive and motor to the liquid end. The motion of the pump drive moves the plunger back and forth, thereby causing suction from the supply tank and pumping the fluid of choice through the attached conveyance infrastructure. This series of pumps generally find pressure peaks at 175 PSI, but are only limited to flow as a matter of wetted end volume. Maximum life of the pump can be achieved by replacing the diaphragm at the recommended service interval. Leak detection can be easily found from the air-filled chamber residing gener- ally at atmospheric pressure on the drive side of the liquid end. This provides the least expen- sive leak detection option in the marketplace.As with any chemical where gas binding can be a problem, it is rec- ommended that a degassing valve be used to release off-gases from the agitation or pressure changes experienced by a liquid having off-gas characteristics. Some of these liquids that can generate off-gases as a result of pressure losses are NaOCl, H2O2, and some specialty chemicals. Mechanically-actuated pumps work well in these applica- tions providing 10:1 turndown as a standard across the product line. The addition of VFD technology and remote stroke control will bring the turndown as high as 100:1.Mechanically-actuated industrial diaphragm pumps are easily maintained and provide years of service for little effort.

Check valve Assembly

Oil Industrial seal

Diaphragm Assembly

Slotted Pan Head Screw Diaphragm Cap

Diaphragm Head

Diaphragm Assembly

ProcessFluid

Set Screw

Check Valve Assembly HydraulicFluid

Available on: MacRoy, Standard Materials of Construction: 316 SS, Alloy 20, Plastic

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