Other options
Finally, the company offers two versions with 4-way manual valves. One requires the operator to both extend and retract the piston. On the other, operating the valve lever extends the normally retracted piston; a built-in spring return automatically retracts the rod when the lever is released.
Pump sizes include 1½-, 2-, 2½-, 3-, and 4-in. bores in user-specified strokes from 1.0 to 50 in. These provide pump displacement volumes ranging from 1.77 in.3 (0.008 gal) per in. of stroke in the 1½-in. bore model to 12.56 in.3 (0.054 gal) per in. of stroke in the 4-in. bore version.
The pumps can be made in different variations, including a choice of seal and pump materials, depending on the application. Seal options for both the drive and pump cylinders include ethylene propylene, Nitrile, PTFE, and Viton. The latter two are especially suited for animal and vegetable oils.
Hall-effect and reed switches are available for end-of-stroke sensing. And units with built-in linear-displacement transducers can provide position feedback to a PLC or other controller.
Information for this article provided by Steve Santoriello of Allenair Corp. Contact the company at (516) 747-5450 or visit www.allenair.com.