Star two-speed Hi-Lo pumps provide rapid movement at low pressure for the part of a cylinder's stroke where no work is encountered. The pump automatically switches to high pressure when the cylinder must deliver maximum push or pull force. Changeover from high volume - low pressure to low volume - high pressure occurs automatically approximately 300 PSI. Star's unique valving allows a single 24" lever to be used for both high pressure and low pressure pumping so there is no need to interrupt pumping to move the lever to another socket. The hand operated model has a choice of screw or cam release. The foot operated model has a release pedal. Built-in reservoirs of any size may be specified. The adjustable overload will be set at the maximum pressure at the factory unless a lower pressure is specified by the customer. The overload can be adjustedby the customer in the field, if required. Also available without reservoirs.
This double acting pump delivers oil whenever the pump handle is moved in either direction. This feature provides a more even flow of oil than the single piston pump which delivers oil when the piston moves in, but no oil when it moves out.
Pumps oil when handle is moved in either direction
Compact Size
Whetted parts are of aluminum, bronze and stainless steel
These pumps provide a low cost efficient means for manually developing or increasing pressure in a hydraulic system. Whether used as the primary pump for a hydraulic system, or a standby pump for emergencies they furnish reliable hydraulic power to operate presses, valves, doors, safety locks and other devices. They are complete pumps with suction and pressure check valves but without release and overload valve. They are made to mount in your manifold block in a standard SAE O-ring port and they eliminate the need for a costly valve body. The handle socket is free to rotate 360° allowing the pump to be operated from any position around the axial centerline.
Star pumps with wetted parts made of brass and stainless steel are available in the following models:
P1A-LR-SC
P4A-LR-SC
SP1A-SC
SP4A-SC
The P1A-LR-SC and SP1A-SC models have one wetted brass part while the P4A-LR-SC and SP4A-SC have all wetted parts made of stainless steel. Lever handle, base plate, socket and links are not stainless steel. Select the required model. Star will manufacture other models in stainless steel to your requirements. All models also available in 100% stainless steel.
For Use With Double Acting Cylinders All of the P, PH and CP series pumps with reservoir are available with 4-way valves for use with double-acting cylinders. This valve allows the pump to advance or retract a double-acting cylinder at full pump pressure.
In a single, compact lightweight unit, Star has combined an efficient pump and durable cylinder that produces one ton lifting capacity. The model HF 500 Jack is easy to operate-takes only 4 1/2 pounds of pedal force per 100 pounds of load, and it is fast acting. For each stroke of the folding pump foot pedal, the cylinder piston rod moves 1/2 inch. The unit has a built-in release pedal for rapid lowering, and the Jack is equipped with lugs that make it easy to mount. Star will provide any cylinder stroke length subject to the limitations shown in the specification table below.
Full 2000 pound lifting capacity
Easily operated pedal type pump-4 1/2 pounds pedal force per 100 pounce of load
When you need something special in Cylinders.... Star hydraulics will build the exact cylinder to meet your requirements-prototype and quantity
For over 30 years, Star Hydraulics has provided the specialized knowledge and skill required to analyze and solve hydraulic cylinder problems. Star builds special cylinders in any quantity (Hydraulic or Pneumatic) from a single cylinder to hundreds
Single or Double-Acting
Telescopic
Pressures up to 15,000 PSI
Capacities to 1500 Tons
Bores to 20"
Rod sizes up to 12"
Strokes to 20 feet
Solid and Hole-Thru Rods.
Star uses a wide variety of Materials: Steel, Brass, Aluminum, Cast Iron, Cast Steel, Bronze and Stainless Steel. Every type of Seal: O-Rings, T-Seals, U-Cups, Vee Rings and Piston Rings. In all Materials: Buna, Viton, Teflon, Urethane and Cast Iron. All Types of Plating: Chrome, Electroless Nickel, Cadmium, Zinc, plus Teflon Coating. Special Valving can also be built into the cylinder. Where extremely adverse environments exist, Star can design cylinders for optimum performance. Meticulous standards of design, engineering and manufacturing assure dependable cylinder performance, long life and minimum maintenance. In addition, at Star we pressure test 100% of our products before shipment.
One man can set-up the post straightener, pump until the post is in a fully upright position, and remove straightener in just a few minutes. The Star post straightener is furnished complete with chain, post clamp, and pump lever bar.
