Hydraulic Sealing Products

Button-enquiry Chevron® - for rods, glands & pistons
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Description
Chevron® (known as Shallex® in some regions) is our universal multi-lip packing that is highly regarded for its long working life and ability to operate under adverse mechanical conditions. When used in split form it can provide major downtime savings.

This robust packing set comprises a gland ring/female adapter, header/male adapter, and one or more intermediate V-shaped rings. The rings are tapered to give an initial interference when confined in the seal housing. The resulting radial force together with the fine finish of the lip, ensure a good seal at low or slack pressures. A scarf abutment is used when the seal is needed in split form.


Special features

  • Recommended for safety critical applications and for adverse mechanical conditions.
  • Double-acting capabilities when fitted back-to-back.
  • Excellent resistance to extrusion and wear.
  • Options available to suit adjustable and non-adjustable axial length housings.
  • Available with Self-aligning Gland Ring. 

Typical applications
Standard materials: most types of hydraulic press (main rams and drawback rams); hydraulic cylinder glands and piston heads; hydraulic valves; oil pipeline expansion glands.
Special materials: reciprocating steam, water, boiler feed and oil pumps; hot oil reciprocating pumps for refinery duties up to +260°C (+500°F); sludge pumps and swivels.

Operating capabilities

  • Maximum operating pressure: 42MPa (6092psi). Modified design and materials can considerably extend this capability.
  • Temperature range (standard materials): -20°C to +100°C (-4°F to 212°F) up to 250mm (9.84 inch) OD, or to +120°C (+248°F) above 250mm (9.84 inch) OD.
  • Maximum temperature (special materials): up to +260°C (+500°F).
  • Maximum surface speed: 0.5m/s (98.4fps). For higher speeds please consult our Technical Services Team..

Materials of construction - up to and including 250mm (9.84 inch) OD
Gland ring/female adapter
(standard material): high performance acetal copolymer.
V-shape intermediate rings (standard material): cotton fabric proofed with blend of synthetic rubbers. 
Header/male adapter (standard material): high performance acetal copolymer.
Special materials for all rings include: A range of solid rubbers. Fabric proofed with hydrogenated nitrile (HNBR), fluorocarbon (FKM) or other rubbers. Acetal, PEEK™, PTFE, UHMWPE, nylon, etc. A range of metals.

Materials of construction - above 250mm (9.84 inch) OD
Gland ring/female adapter (standard material): cotton fabric proofed with a blend of synthetic rubbers.
V-shape intermediate rings (standard materials): cotton fabric proofed with a blend of synthetic rubbers.
Header/male adapter (standard material): solid hard rubber, or cotton fabric proofed with a blend of synthetic rubbers.
Special materials for all rings include: A range of solid rubbers. Fabric proofed with hydrogenated nitrile (HNBR), fluorocarbon (FKM) or other rubbers. Acetal, PEEK™, PTFE, UHMWPE, nylon, etc. A range of metals.

Media capabilities
Standard materials are suitable for use with most mineral based hydraulic fluids, most fire-resistant fluids of the water/oil or water/glycol types at  temperatures up to 100°C (212°F). Also resistant to air, water and most lubricating oils and greases. Where fire-resistant fluids are used it is essential to advise our Technical Support Team of the type and designation due to the variable effects that can occur with different grades.

Special materials considerably extend the range of application in terms of temperature, fluid compatibility and abrasion resistance. Ask our Technical Support Team for further information.

How supplied
Available in radial sections from 4mm (0.16 inch) upwards; spring-loaded version from 6.5mm (0.26 inch). Endless rings available up to 2.2m (87 inch) OD.

Endless packing sets in standard materials to suit housings to BS ISO 5597 - Long (L3) axial length housings are readily available. Inch sizes and split packing sets are also available. Fitting instructions are supplied with every set. 

Find the right size standard seal
Please visit our Selector for hydraulic seals to discover if one of our standard size seals will match your application. Then check seal suitability for your anticipated working pressure, speed, temperature range, and hydraulic fluid media, or contact us for expert advice. 

If Selector cannot find a match for your application, please contact us directly, as we have thousands of mould tools for non-standard sizes, and the one you want could easily be among them. Also, please consult our Hydraulic Sealing Products – Size Charts guide on our PDF Downloads page, as this contains a wealth of extra information on seal sizes and availability.