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Wilden Air Systems


Wilden® Air Distribution Systems Defined


Pro-Flo® Shift

Pro-flo® ShitWilden®’s Pro-Flo® SHIFT Air Distribution System (ADS) represents a significant breakthrough in energy efficiency as industrial plants work to reduce air consumption as well as their carbon footprints. Available in Wilden®’s Advanced™ and Original™ Series air-operated double-diaphragm (AODD) pumps, the Pro-Flo® SHIFT:
•Achieves up to 60% savings in air consumption
•Delivers more yield per SCFM versus competitive AODD pumps
•Costs 50% less than electronically actuated ADS
•Has fewer operating parts, meaning less downtime and simplified maintenance
•Is available in a single-point exhaust option (for submersible applications)
•Features plug-and-play operation See how the ProFlo® Shift Works

Pro-Flo® X

Pro-Flo X The Pro-Flo® X is the latest innovation to the AODD pump world. The development of Wilden®'s Pro-Flo® X air distribution system (ADS) is derived from the Pro-Flo® family and offers an alternative with operational flexibility never before seen. This flexibility is accomplished by the patent pending Efficiency Management System (EMS) which optimizes the Pro-Flo X® ADS for the actual operation parameters, regardless of application demands or pump size. The Pro-Flo® X and EMS technology are simple and easy to use. The integrated control dial located at the top of the ADS allows users to control the flow rate that best suits the application. This can lead to higher performance, lower operational costs and performance flexibility that goes far beyond what was considered the industry standard.

Pro-Flo®

Pro-FloThe Pro-Flo® was the precursor to the Pro-Flo® X air system.  The patented air distribution system incorporates three moving parts: The unbalanced air valve spool, the pilot spool, and the main shaft/diaphragm assembly. When the shaft reaches the end of its stroke, the opposite inner piston actuates the pilot spool. The smaller end of the spool is pressurized continuously, while the pilot spool either pressurizes or exhausts the large end of the unbalanced air valve spool. The unbalanced air valve spool location directs pressurized air to one air chamber while exhausting the other. The pressurized air chamber causes the main shaft/diaphragm assembly to move outward discharging liquid on that side and pulling liquid in on the other side.
This system is supplied with primarily polyprolylene components and is used exclusively on the Advanced plastic pumps.

Turbo-Flo®

Turbo-floJim Wilden® invented the Air Operated, Double Diaphragm pump and the key component of his original design was a brass air valve with anodized aluminum piston. This lubricated design is still useful in many applications today. The pumps originally used the "M" Series designation, such as M2, M4, M8 and M15. The designation has been changed to the "T" Series, for Turbo-Flo, and the designations are T2, T4, T8 and T15.
The Turbo-Flo air distribution system operates on differential pressure only; there are no mechanical trip rods, bearings or springs to wear or repair. Its externally serviceable air valve body is attached to a center block, which houses specialized Glyd ring seals. The air valve piston within the air valve body routes the air supply to one of two air chambers as dictated by its position. As the air chamber fills with air, the diaphragm is displaced, thus pulling the connecting shaft and opposite diaphragm toward the center block. As the shaft moves, slots on the shaft break a seal created by center block Glyd rings. When this seal is broken, a low-pressure area is created at one end of the air valve body causing the piston to shift up or down vertically alternately supplying each air chamber with pressurized air to displace each diaphragm. Air valve tolerances allow for the passage of some moisture and air line particulates allowing free movement of the air valve.

Accu-Flo®

Accu-floThe Accu-Flo® system allows for a direct electrical interface that allows control of the pump stroke rate. The Accu-Flo® pump technology employs a two-position, four-way solenoid valve that has a single operator and spring return. The valve is internally air piloted for longer coil and operator life. Air pressure is utilized to fill air chambers and displace the diaphragms as on typical air operated, double diaphragm pumps, but electrical impulses dictate the stroke rate. When the solenoid is unpowered, the air valve piston is held by a spring to the top of the air valve body. In this position, the air supply is directed to the right side of the pump while the left air chamber is exhausted. When the solenoid is powered by electricity, air pressure is routed to the top of the air valve piston which overcomes the tension of the spring and forces the piston down. In this position, the air valve piston directs the air supply to the left side of the pump and exhausts the right side. By alternately applying and removing electrical power, the Accu-Flo® pump reciprocates back and forth similar to standard air-operated pumps.

Wilden® 1.5" FIT Pumps Decisively Outperform Warren Rupp® SANDPIPER 1.5" and 2" Pumps


When operating at SANDPIPER’s max air inlet, the scenario is much like our recent Graco® Head-To-Head example. As shown in the chart above, the Wilden® PS420 FIT (1.5") pump matches SANDPIPER's 2" pump performance until it is pushed to more extreme discharge flow rates. At 120 psig (derated from 125 psig to meet SANDPIPER's maximum air pressure), the Wilden PS420 FIT (1.5") pump expands capability to keep pumping where SANDPIPER falls short.

Take away

  • Wilden PS420 FIT (1.5") bolted pump has superior flow rate performance at 120 psig and 100 psig when compared against the SANDPIPER 1.5" pump
  • Wilden PS420 FIT (1.5") bolted pump can replace the larger 2" SANDPIPER pumps for less cost while meeting and exceeding flow rate requirements
  • Wilden PS420 FIT (1.5") bolted pump is equipped with the most efficient ADS in its class: Pro-Flo® SHIFT. The Pro-Flo SHIFT restricts air flow and prevents risk of overfill thus reducing air consumption and ultimately reducing energy When operating at SANDPIPER’s max air inlet, the scenario is much like our recent Graco® Head-To-Head example. As shown in the chart above, the Wilden® PS420 FIT (1.5") pump matches SANDPIPER's 2" pump performance until it is pushed to more extreme discharge flow rates. At 120 psig (derated from 125 psig to meet SANDPIPER's maximum air pressure), the Wilden PS420 FIT (1.5") pump expands capability to keep pumping where SANDPIPER falls short. Take away ◾Wilden PS420 FIT (1.5") bolted pump has superior flow rate performance at 120 psig and 100 psig when compared against the SANDPIPER 1.5" pump ◾Wilden PS420 FIT (1.5") bolted pump can replace the larger 2" SANDPIPER pumps for less cost while meeting and exceeding flow rate requirements ◾Wilden PS420 FIT (1.5") bolted pump is equipped with the most efficient ADS in its class: Pro-Flo® SHIFT. The Pro-Flo SHIFT restricts air flow and prevents risk of overfill thus reducing air consumption and ultimately reducing energy costs.
    See more head to head comparisons at Wilden's Web Site

NOTE: All information gathered and represented comes from published Graco and Warren Rupp performance data.

SANDPIPER, a Warren Rupp, Inc. brand Warren Rupp®, Inc. is registered trademark of IDEX® Corporation

Pump will not run or runs slowly
1. Ensure that the air inlet pressure is at least 5 psig (0.35 Bar) above startup pressure and that the differential pressure (the difference between air inlet and liquid discharge pressures) is not less than 10psig (.7 Bar).
2. Check air inlet filter for debris (see recommended installation).
3. Check for extreme air leakage (blow by) which would indicate worn seals/bores in the air valve, pilot spool and main shaft.
4. Disassemble pump and check for obstructions in the air passageways or objects which would obstruct the movement of internal parts.
5. Check for sticking ball check valves. If material being pump is not compatible with pump elastomers, swelling may occur. Replace ball check valves and seals with proper elastomers. Also, as the check valve balls wear out, they become smaller and can become stuck in the seats. In this case, replace balls and seats.
6. Check for broken inner piston which will cause the air valve spool to be unable to shift.
7. Remove plug from pilot spool exhaust.
8. Ensure that air supply is attached to pump center section (air inlet) and NOT to pump air valve body.

Pump runs but little or no product flows
1. Ensure that the EMS dial is set appropriately for the application. An EMS setting of “4” provides maximum flow, while an EMS of “1” is reserved for a reduction in flow and air usage. See www.Wilden®®pump.com/seemoregreen for more information.
2. Check for pump cavitation; slow pump speed down to allow thick material to flow into the liquid chambers.
3. Verify that vacuum required to lift liquid is not greater than the vapor pressure of the material being pumped (cavitation).
4. Check for sticking ball check valves. If material being pump is not compatible with pump elastomers, swelling may occur. Replace ball check valves and seals with proper elastomers. Also, as the check valve balls wear out, they become smaller and can become stuck in the seats. In this case, replace balls and seats.

Pump air valve freezes
1. Check for excessive moisture in compressed air. Either install a dryer or hot air generator for compressed air. Alternatively, a coalescing filter may be used to remove the water from the compressed air in some applications.

Air bubbles in pump discharge

1. Check for ruptured diaphragm.
2. Check tightness of outer pistons. Check tightness of clamp bands and integrity of O-rings and seals, especially at intake manifold.
3. Ensure pipe connections are airtight. Product comes out air exhaust.
4. Check for diaphragm rupture.
5. Check tightness of outer pistons to shaft

Product comes out air exhaust
1. Check for diaphragm rupture.

2. Check tightness of outer pistons to shaft.


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