2 Hydraulics
The hydraulic parts in the Helix dispenser are listed below. These basic parts are discussed in
detail in this section.
•
Product Tubes
•
Strainer and Filter (Remotes)
•
Strainer and Filter (Suction Pumps)
•
Proportional Flow Control Valve
•
iMeter and WIP
•
Check & Pressure Relief Valve
•
Hose Outlet Casting
•
Vapor (Vapour) Recovery
2.1 Triple Bump Product Tubes
Helix dispensers use triple bump product tubing between the proportional valve and the new
hose outlet casting. As with the double bump tube, the triple bump connection eliminates the
need to torque the compression fittings that were used on flare tubing. The triple bump tube,
along with a circular retainer in the hose outlet casting, eliminates the need for a retaining pin
at the outlet casting.
The triple bump tube and retaining pin are shown in Fig 2.1. When the tube is inserted into the
outlet or valve casting, the o-ring compresses and spreads across the space between the first
and second bumps, making a tight seal around the cylinder. The tube retaining pin at the valve
and the retaining clip at the hose outlet are inserted between the second and third bumps. The
tube retaining pin and clip secure the tube, but they also improve the seal by allowing some
flexibility as to exactly where the seal is made. The clip is shown in Figure 2.7.
Product tubes are 24 mm in diameter, which is slightly larger than the 7/8" tubes on previous
dispenser model series. The tubes have slightly larger outer diameter, but they also have a
larger inner diameter which allows for increased flow rate.
The valve castings are different on Helix dispensers, but only because of the increased distance
between the two holes for the new tube retaining pin. The valve castings are made from the
same material and have the same inner diameter as the valve castings on previous Wayne dis-
pensers. The valve castings will support 24 mm triple bump or 7/8" double bump tubes because
the outer diameter at the triple and double bump locations on the tubes are the same. Both Helix
series dispensers and current Wayne Ovation™ fuel dispensers use this newer valve casting
and retaining pin.
WM048523 Rev 08 01/2019 13
2 Hydraulics
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