Hunger Hydraulic UK Ltd

GD1000K Piston Seal

HUNGER slide ring seal type GD1000K is a 6 part piston seal for sealing and guiding double acting cylinders. The seal design and materials makes it particularly suitable for the most demanding heavy duty applications.

The GD1000K consists of a special shaped elastic energiser ring of a modified NBR, a slide ring of abrasion resistant PTFE-Bronze compound which acts as the sealing ring, two lateral supports rings of modified PUR and two bearings rings of pressure-resistant POM-PTFE-Bronze compound.

The energiser ring presses the sealing ring against the cylinder wall, providing a sealing function at zero working pressure. The onset of pressure increases the radial force pressing the slide ring against the cylinder wall, thereby increasing the sealing effect. The two support rings prevent gap extrusion of the slide ring at high pressures. The profile of the support rings encourages uniform fluid and pressure distribution to the elastic inner ring. The bearing rings positioned adjacent to the support rings make contact with the cylinder wall to guide the piston. The bearing ring design ensures there is no metallic contact between the piston and the cylinder tube.

The seal has very low friction and excellent efficiency giving stick slip free movement under all conditions.

HHN 805 Standard Cylinders

25 MPa/250 bar

• 375 bar Static Test Pressure
• Front and Rear heads externally screwed construction
• Piston diameters from 40 to 250 mm
• Hunger DFE seals and bearing elements
• Refined design and construction, tested in operation multiple times
• 12 bore sizes from 40 to 250 mm
• 12 rod diameters from from 22 to 140 mm
• Ports threaded BSP or metric
• Cylinder bores and piston rods finished honed Ra < 1 µm
• Cushioning at both ends. Fixed for bores 40 and 50 mm and adjustable for bores 63 to 250 mm
• Check valves with air bleeds both ends
• Double ended versions available

Telescopic cylinders HHN 810

20 MPa/200 bar

Standard Single Acting:

• Stage diameters from 27 to 170 mm
• Single acting, multi-stage
• Hunger DFE seals and bearing elements

Special Single & Double Acting:

• 50 m stroke already produced, larger extensions possible
• Bespoke designs specific to individual application requirements
• Synchronized constant velocity versions available e.g. for passenger lifts
• Cylinders produced for lifting platforms, vehicle construction, bridge lifts, nuclear decommissioning.

HHN 811 - Steel Works Standard Cylinders

35 MPa/315 bar

• 525 bar Static Test Pressure
• Front and Rear heads bolted construction
• Piston diameters from 40 to 320 mm
• Hunger DFE seals and bearing elements
• Refined design and construction tested in operation multiple times
• 14 bore sizes from 40 to 320 mm
• 14 rod diameters from from 28 to 220 mm
• Ports threaded BSP or metric
• Cylinder bores and piston rods finished honed Ra < 1 µm
• Cushioning at both ends adjustable by means of throttle valves
• Check valves with air bleeds both ends
• Double ended versions available

HHN 812 - Steel Works Standard Cylinders

25 MPa/250 bar

• 375 bar Static Test Pressure
• Front and Rear heads bolted construction
• Piston diameters from 40 to 320 mm
• Hunger DFE seals and bearing elements
• Refined design and construction tested in operation multiple times
• 13 bore sizes from 40 to 320 mm
• 16 rod diameters from from 22 to 220 mm
• Ports threaded BSP or metric
• Cylinder bores and piston rods finished honed Ra < 1 µm
• Cushioning at both ends adjustable by means of throttle valves
• Check valves with air bleeds both ends
• Double ended versions available

HHN 813 Standard Cylinders

16 MPa/ 160 bar CETOP-R 58 H

• 240 bar Static Test Pressure
• Front and Rear heads externally screwed construction
• Piston diameters from 25 to 250 mm
• Installation dimensions in accordance with CETOP Standard R 58 H
• Hunger DFE seals and bearing elements
• Refined design and construction, tested in operation multiple times
• 12 bore sizes from 25 to 250 mm
• 12 rod diameters from from 22 to 140
• Ports threaded BSP or metric
• Cylinder bores and piston rods finished honed Ra < 1 µm
• Cushioning at both ends. Fixed for bores 22 to 50 mm and adjustable for bores 63 to 250 mm
• Check valves with air bleeds are provided both ends

HHN 814 - Steel Works Standard Cylinders

25 MPa/250 bar CETOP RP 73 H

• 375 bar Static Test Pressure
• Front and Rear heads bolted construction
• Piston diameters from 50 to 250 mm
• Installation dimensions in accordance with CETOP Standard RP 73 H
• Hunger DFE seals and bearing elements
• Refined design and construction, tested in operation multiple times
• 8 bore sizes from 50 to 250 mm
• 16 rod diameters from from 32 to 180 mm
• Ports threaded BSP or metric
• Cylinder bores and piston rods finished honed Ra < 1 µm
• Cushioning at both ends adjustable by means of throttle valves
• Check valves with air bleeds both ends
• Double ended versions available

HHN 815 - Tie Rod Cylinders

10,5 MPa/105 bar

• Piston diameter 32 to 200 mm
• Dimensions in accordance with N.F.P.A. and ISO recommendations
• Hunger DFE seals and bearing elements
• Refined design and construction, tested in operation multiple times
• 9 bore sizes from 32 to 200 mm
• Each with 2 alternative rod diameters from 18 to 140 mm
• 14 different mounting styles
• Ports BSP or metric
• Cylinder bores and piston rods finished honed Ra < 1 µm
• Cushioning both ends: fixed for bore diameters 32 and 40, and adjustable from 50 to 200 by means of throttle valve
• Check valves with air bleeds both ends
• Double ended versions available

HHN 816 - Tie Rod Cylinders

21 MPa/210 bar

• Piston diameters from 40 to 200 mm
• Dimensions in accordance with N.F.P.A. and ISO recommendations
• Hunger DFE seals and bearing elements
• Refined design and construction, tested in operation multiple times
• 9 bore sizes from 40 to 200 mm
• Each with 2 alternative rod diameters, from 18 to 140 mm
• 14 different mounting styles
• Ports BSP or metric
• Cylinder bores and piston rods finished honed Ra < 1 µm
• Cushioning both ends adjustable by means of throttle valves
• Check valves with air bleeds both ends
• Double ended versions available

Hunger Honing Stones

High performance honing stones for internal and external honing.  

Ceramic stones for machining and finishing tubes and rods with high stock removal rates at low contact pressure and guaranteed dimensional accuracy.

Diamond honing bars for the finishing of large diameters and long lengths of ceramic coated piston rods, with high removal rates and superlative finish.

Diamond tools used also in machine tooling and automotive manufacturing to finish engine blocks, connecting rods, brake cylinders and valves. Development of complete tool systems to meet the special requirements of the automotive industry.

Surface finishes of 0.1 µm Ra possible even at high rates of removal.

Product range:

• Diamond honing bars
• Diamond honing tools
• Ceramic honing stones
• Dove-tail honing stones
• Dove-tail honing tools