Medium Duty Service Industrial Tie Rod Construction
Nominal Pressure — 1000 PSI — Depending on Bore Size
Standard Bore Sizes 1” through 8”
Piston Rod Diameters — 1/2” through 5-1/2”
17 Standard Mounting Styles
The medium-duty hydraulic cylinder with a proven record of performance.
Parker Series 3L cylinders have established an impressive record of millions of continuous maintenance-free cycles. Each one is built with important extras you wouldn’t ordinarily find in cylinders designed for 1,000 psi nominal operating pressure. Patented “Jewel” rod gland for longer life and lower operating costs. High yield-strength and rolled threads add extra strength to rod end studs. High strength tie rods also with rolled threads instead of just cut. And every Parker cylinder is individually tested before it is shipped. Parker puts more into the Series 3L so you get more out.
Adjustable floating cushions
Cushions are optional and can be supplied at head end, cap end, or both ends without change in envelope or mounting dimensions. All Parker cushions are adjustable. The Series 3L cylinder design incorporates the longest cushion sleeve and cushion spear that can be provided in the standard envelope without decreasing the rod bearing and piston bearing lengths.
In the cushion performance chart, pressure traces show the results of typical orifice flow conditions. Tests of a three-step sleeve or spear show three pressure pulses coinciding with the steps. The deceleration cushion plunger curves shape comes very close to being theoretical, with the 1/2 inch exception of the last of travel.
(1) When a cushion is specified at the head end:
a. A self-centering sleeve is furnished on the piston rod assembly.
b. A needle valve is provided that is flush with the side of the head when wide open. It may be identified by the fact that it is socket keyed. It is located on side number 2, in all mounting styles except D, DB, DD, and E. In these styles it is located on side number 3.
c. On 3-1/4!! bores and larger, a spring less check valve is provided that is also flush with the side of the head and is mounted adjacent to the needle valve except on certain bores of mounting style C where it is mounted opposite the needle valve. It may be identified by the fact that it is slotted.
d. The check and needle valves are interchangeable in the head.
e. V- 21/2 bore 3L’s utilize a slotted sleeve design in place of the check valve.
(2) When a cushion is specified at the cap end:
a. A cushion spear is provided on the piston rod assembly.
b. A “float check” self-centering bushing is provided which incorporates a large flow check valve for fast “out-stroke” action.
c. A socket-keyed needle valve is provided that is flush with the side of the cap when wide open. It is located on side number 2 in all mounting styles except D, DB, DD, and E. In these styles it is located on side number 3.