Heavy-Duty (PAV) Series

Used with fine products that can smear or pack between the housing and rotor tips. The trailing edge of each blade is machined at a 15° angle narrowing the “land area.” This feature increases operating efficiency by minimizing drag and horse power.

Built with side plates machined to the same diameter as the blade tips, sealing the entire pocket at the rotor diameter. These rotors reduce wear on the end plates and shaft seals, reduce air leakage and contain certain types of free-flowing products that tend to "flush through."

Rotors reduce displacement by 25%, 50% or 75% of the original capacity. They are used for two purposes: 1) to handle sticky products that tend to pack in the narrow pocket bottoms and 2) when a higher RPM is required to provide accurate, continuous flow in feeding applications.

Wear bars offer an effective means of renewing the wear portion of the rotor. For general use and are available in various materials, such as brass, AR400 Alloy, stainless steel and certain alloys are available.

Flexible tips are typically used for handling stringy or fibrous materials that would otherwise jam traditional, hard tip rotors. For general use and are available in Neoprene® or Teflon®.

Used when handling larger particles or pellets that can shear or jam between the rotor tips and housing. Inlet baffles limit material to filling the back half of the pocket, wipe the blade tips prior to entering the housing and reduce degradation of friable materials. Available in mild or stainless steel.

Efficiently designed to transition the airlock discharge to a pneumatic conveying line while adding minimal height to the valve. Compared to "blow through" airlocks, where pneumatic air forces material through the rotor pocket, drop-through designs result in minimal wear of the valve internals.

316 Cast Stainless steel available on all Heavy Duty (PAV) Airlocks* except for the (PAV-2830)

Coatings are used to enhance the wear characteristics of soft base materials, improve corrosion resistance, modify electrical conductivity and create thermal barriers.

Teflon: non-stick coating for products/applications that may stick.

Chrome: Industrial hard chrome plating improves resistance to wear and abrasion up to 850ºF.

Tungsten Carbide: This spray on coating provides corrosion resistance and wear resistance to parts and materials.

New abrasion resistant packing rings provide additional wear resistance against abrasive powders and a more form-fitting, positive seal around the shaft. Additional packing rings are included for sealing against higher internal valve pressures. Tighter tolerances provide better support for the packing and throttle air leakage from within the valve. Self-adjusting packing glands are replaced with manually adjusted packing glands capable of additional pressure. For Fine, Free-Flowing and Abrasive Chemical Powders

Lantern Rings

On applications with abrasive materials or for higher internal air pressure, lantern rings permit air purging of the shaft seals. This prolongs seal life by preventing gas from escaping and from fine abrasive powders from contaminating conventional seals. Available in bronze or nylon.

Air Purge Kit

Kit includes electronically operated air valve in NEMA 4 or NEMA 7/9 construction, filter/ regulator with gauge, flow meters and oversized lines for proper flow to the lantern rings* (not included in kit. Sold separately.) Airlock will ship with kit installed on specially designed mounting bracket.

Kit includes High temperature bearings, stainless steel spring retainer & packing glands, graphite seals up to 1000°F and metal OSHA guard. Kit items may be sold separately.

Optional NPT fitting tapped and plugged for shipment. Option recommended with the airlock discharges to a pressurized environment. Venting provides a means to displace the air that pressurizes empty rotor pockets before they return to the inlet side of the valve, thus optimizing product flow into the valve.

STANDARD Inverter Duty gearmotor, Heavy-Duty motor base, polyethylene OSHA guard, sprockets and chain. Optional motor classes and AC Frequency drives for variable motor speed. *Other options may be entertained at customer's request.

Available Motor Classes:

Totally Enclosed, Explosion Proof (TEXP) - for use in hazardous environments.

Totally Enclosed, Fan Cooled (TEFC) - This motor is probably the most commonly used motor in ordinary industrial environments.

Totally Enclosed, Not Ventilated (TENV) - This motor is used in a wide variety of smaller horsepower variable speed applications. It is particularly effective in environments where a fan would regularly clog with dust or lint.

Washdown Duty: Designed for use in applications where the motor is exposed to water and high humidity. These motors are designed for frequent cleaning with a high-pressure spray. Some typical applications that utilize Washdown Duty motors include food processing plants, canneries & car washes.

This unique feature allows for a continual and equalized pressure applied to the packing, thus reducing the possibility of product leaking from the valve and damaging the outboard bearings. The design helps approach the first Maintenance-Free airlock built in the world.

Self-Adjusting

This unique feature allows for a continual and equalized pressure applied to the packing, thus reducing the possibility of product leaking from the valve and damaging the outboard bearings.

Manually Adjusted

For fine, abrasive powders or when preferred, self-adjusting packing glands can be replaced with manually adjusted packing glands capable of additional pressure.

The sensor provides airlocks, running or stopped, feedback to the control or alarm system. The switch shuts off the airlock.

These are available in several shear strengths. They are used to prevent damage to the airlock caused by overloading or jamming. Specified where the airlock will be handling large particles under full load.

NEW! Prater now offers an electronic shock relay to take the place of shear pins. These simple to install devices protect from damaged caused when a valve jamb occurs by allowing the user additional flexibility to set a threshold BELOW full motor amperage without sacrificing operational quality due to nuisance.