Liquid Power

November 5, 2007

3 Min Read
Liquid Power

An obvious trend in hydraulic design is providing options for users. While other factors are important and often critical in high-pressure applications that can easily exceed 2,500 psi or more, design flexibility stands out. Proper materials provide the foundation for the hydraulic product's successful operation. Standard units usually are fixed in these areas but, in some cases, options are available without requiring a custom design. A cylinder and two valves show suppliers' efforts to make products that easily adapt to users' needs.

HYDRAULIC CYLINDER

Bailey International's CHIEFWX cylinder provides several mounting positions. An adjustable 360-degree rotating gland with lock wire allows easy adjustments for port alignment. All ports are recessed with one located on the rotating gland and two on the fixed base end. Intended for use in double-acting applications, the design uses a twin-lip design rod seal with a D Style rod wiper to prevent contamination. Other key attributes include a piston seal made of Hallite 755, a ductile iron piston with a wear ring made of glass-filled Nylon and a keyed-joint ductile iron gland. The tube seal consists of a Buna O-ring with Polytemp hytrel backup. Both the rod end and base end have zerk grease fittings and mount crosswise on the tube. Available in bore sizes from 2.5 to 4 inch and strokes from 4 to 60 inch, the cylinder has a 3,000 psi operating range.

SEALLESS DIAPHRAGM VALVES

Hydra-Cell Industrial Pumps of Wanner Engineering Inc. C60 Series regulating valves offer users a choice of materials. The steel, nickel alloy or solid brass units accept 0.75 to 1.25 inch NPT/BSPT plumbing. To prevent excess system pressure, the valves bypass system fluid if a system discharge is completely closed. The design also balances system pressure for multiple-gun operations. Providing flow rates from 0 to 40 gpm (151.4 lpm), the valves can handle pressures from 75 to 2,500 psi, with fluid temperatures up to 200F. The valve design uses a tapered plunger with a valve seat that is isolated by a Viton or Teflon diaphragm between the wet end of the valve and the valve top. Excess pressure overcomes an adjustable spring's force on the plunger, lifting it off the seat and allowing fluid to bypass and reduce system pressure. The design eliminates premature failure of the plunger seal that can occur in conventional sealed valves.

DIRECTIONAL CONTROL VALVES

Continental Hydraulics PowrFlow valves have interchangeable spools for easy field maintenance. The 12 standard spools, as well as specialty spools, use U-groove machining for greater resistance to contaminants than v-groove designs. With maximum flow rates from 20 to 275 gpm, valves withstand pressure up to 5,000 psi. Locating bolt heads below the spool centerline reduces the body distortion that can lead to sticking spools and loss of production. Available actuator types include solenoid, air, cam, lever and soft-shift styles. Compatible fluids include petroleum-base, most phosphate esters, water-based fluids (not more than 40 percent water) and water glycol. Target applications include machine tool indexing, feeding and motion control devices, mobile and stationary lift equipment, food processing machinery and more.

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