What is Metric Compact Piston Seals?

Style ERKO Double-acting three piece piston seal. 80 Durometer Nitrile with fabric reinforced Nitrile and Nylon guide rings. The sealing action is effected by the fabric reinforced Nitrile member at the dynamic side. Lubricants such as oil and grease are able to penetrate the fabric and allow the seal to be highly wear resistant. Can easily be to one piece pistons. Style EZE Double-acting three piece piston seal. 80 Durometer Nitrile with fabric reinforced Nitrile and Nylon guide rings. Consists of a solid rubber element that is reinforced with fabric on both sides. This gives the seal excellent resistance to pressure surges. Style EZM Double-acting five piece piston seal. 80 Durometer Nitrile with Hytrel back-up rings and Nylon guide rings. Consists of a Nitrile rubber sealing element that effects both static and dynamic sealing. The back-up rings and the guide rings are of the split type. The low profile of the guide rings provides simple installation. Not suitable for retaining applications. Style EZW Double-acting three piece piston seal. 80 Durometer Nitrile with fabric reinforced Nitrile and Nylon guide rings. Heavy duty seal for multi-piece pistons. The robust profile and the sturdy right angle of the back-up/support rings give the seal high resistance to peak pressures and pressure surges. Rated to 7500 psi. Style L43 Double-acting five piece piston seal. 80 Durometer Nitrile with Hytrel back-up rings and Nylon guide rings. The hardness of the materials used in the construction of each component of the seal increases from the inside component to the outside component. As a result, the performance of each individual component is optimized in performing the individual functions of sealing, bridging the gap, and guidance within the cylinder tube.

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What is Piston Seals?

Two-part seal requiring no lubrication. Piston design is simplified; and sticking, slipping, and breakaway problems are eliminated. Damage associated with cast iron or phenolic piston ring particles is eliminated as well as cylinder wall scoring. Provides bi-directional sealing. Easy installation and removal, and can be cut in the field for easier installation. Inference fit assures positive sealing. Conforms to out-of-round bore conditions. Pressures to 5000 psi. ASP provides piston seals with 70 Durometer Nitrile Expanders. Other compounds are available by special order.

Square Piston Seals Style TPR1400

 Square profile 15% glass filled PTFE with 70 Durometer Nitrile O-Ring (Expander)

Rectangular Piston Seal Style TPR1800

Rectangular profile 15% glass filled PTFE with 70 Durometer Square Cut Ring

Piston Seal Installation Data 

1. Clean piston in solvent and dry. Inspect groove and end of piston for nicks or burrs which could damage the expander/piston ring.

2. Lubricate expander with a compatible lubricant for easier installation. Caution: Be sure expander is not twisted or distorted in groove.

3. Install the piston ring over a 10° included angle mandrel onto the piston body and into the groove in a single motion as quickly as possible. Do not use pry bars, screwdrivers, knife blades, or any metal object to install piston rings this will damage piston and seal.

4. After installation of the piston ring, carefully guide the piston into the chamfered cylinder bore carefully (check bore first for burrs, sharp edges and foreign material). If bore is not chamfered, use a smooth, lubricated and tapered piston ring compressor to facilitate installation.

5. To remove a worn piston ring, carefully cut through the PTFE piston ring and remove. Do not cut into the expander unless it is to be replaced also. Use care not to damage groove walls and create burrs or sharp edges.

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