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Parker Hydraulic Cylinders Heavy Duty Series 2H

Exclusive with the Parker Stepped Cushion for increased performance and productivity
Faster cycle time
Reduced hydraulic shock
Reduced machine noise
Lower machine maintenance
Heavy Duty Service ¨C Industrial Tie-Ro Construction
Nominal Pressure-3000 PS
Standard Bore Sizes - 1-1/2" through 6"
Piston Rod Diameters - 5/8" through 4"
18 Standard Mounting Styles
The heavy-duty hydraulic cylinder with features only Parker can promise and deliver!
Series 2H cylinders keep on performing like you expect from Parker — producing more power per pound, more power per dollar—over millions of trouble-free cycles. Everything you need for reliable 3,000 psi performance. Patented “Jewel” rod gland for longer life and lower operating costs. Chrome- plated, case hardened piston rods. Rod end studs of high yield-strength steel, with rolled threads for added strength. Tie rods with rolled threads and steel nuts. Floating cushions with float-check action and positive metal-to-metal seal. And every Parker cylinder is individually tested before it leaves our plant.
• Heavy Duty Service — NFPA specifications and ANSI B93.15-1981 mounting dimension standards
• Standard Construction — Square Head — Tie Rod Design
• Nominal Pressure — 3000 RS.l.*
• Standard Fluid — Hydraulic Oil
• Standard Temperature—-1 0 deg Fto +165 deg F**
• Bore Sizes — 1h/2 through 6” (Larger sizes available)
• Piston Rod Diameter — /8” through 4”
• Mounting Styles — 18 standard styles at various application ratings
• Strokes — Available in any practical stroke length
• Cushions — Optional at either end or both ends of stroke. “Float Check” at cap end.
• Rod Ends — Three Standard Choices — Specials to Order
Parker’s New, Exclusive Stepped floating cushions combine the best features of known cushion technology.
Deceleration devices or built-in “cushions” are optional and can be supplied at head end, cap end, or both ends without change in envelope or mounting dimensions. Parker cylinder cushions are a stepped design and combine the best features of known cushion technology.
Standard straight or tapered cushions have been used in industrial cylinders over a very broad range of applications. Parker research has found that both designs have their limitations.
As a result, Parker has taken a new approach in cushioning of industrial hydraulic cylinders and for specific load and velocity conditions have been able to obtain deceleration curves that come very close to the ideal. The success lies in a stepped sleeve or spear concept where the steps are calculated to approximate theoretical orifice areas curves.
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 exception of the last 1/2 inch of travel. This is a constant shape in order to have some flexibility in application. The stepped cushion design shows reduced pressure peaks for most load and speed conditions, with comparable reduction of objectionable stopping forces being transmitted to the load and the support structure.
All Parker Hannifin cushions are adjustable. The Series 2H cylinder design incorporates the longest cushion sleeve and cushion spearthatcanbe provided in the standard envelope without decreasing the rod bearing and piston bearing strengths.
(1) When a cushion is specified at the head end:
a. A self-centering stepped sleeve is furnished on the piston rod assembly.
b. A needle valve is provided that is flush with the side of the head even 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, JJ, HH and E. In these styles it is located on side number 3.
(2) When a cushion is specified at the cap end:
a. A cushion stepped spear is provided on the piston rod.
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, JJ, HH and E. In these styles it is located on side number 3.

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