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Home/Products/Pneumatic Seals
Pneumatic Seals 2017-01-31T16:23:25+00:00

Pneumatic Seals

Pneumatic seals are a device that restricts the escape of air or the entrance of foreign materials in a pneumatic application such as a cylinder. Pneumatic Seals are designed for low operating pressure. Pneumatic Seals are vital in machinery. Pneumatic Seals may be used for rotary and reciprocating motion. Pneumatic cylinders typically demand higher operating speeds and lower friction pneumatic seals.

Common pneumatic seals include: rod seals, piston seals, symmetrical seals, V-Rings, wipers, rotary shaft seals, wear rings, static seals, back-up rings, o-rings, buffer rings, u-cups and gaskets. Pneumatic seals can be single or double acting. Single acting pneumatic seals are used for one axial direction only. Double acting pneumatic seals are used in both directions for a reciprocating motion. Pneumatic seals can be made of a variety of materials: Polyurethane, Nitrile, FPM/Fluorocarbon Rubber, Silicone, EPDM and some PTFE.

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Rod Seals are the most critical seals in a pneumatic cylinder. Rod Seals are radial internal seals. Rod Seals are press-fit into a housing bore with the sealing lip contacting the shaft. Rod Seals are also referred to as shaft seals sometimes. Rod Seal failure could result in leakage. Special care should be shown in selecting the best Rod Seal for your sealing application. Rod Seals act as a dynamic seal along its inner diameter and static along its outer diameter. Rod Seals are affected by changes to the rod surface and temperatures. Rod Seals often see the highest pressure variation. Rod Seals are often the decisive factor in the function of a pneumatic cylinder.

DS101

DS102

DS102R

DS103

DS104

DS104R

DS105

DS106

DS107

DS108

DS109

DS110-112

DS116

DS117

DS117R

DS118

DS119

DS120

DS124

DS125

DS126-128

DS129

DS131

DS138

DS139

DS141

DS142

DS199

DS205

DS238

**OTHER ROD SEAL STYLES**

Piston Seals are radial seals. Piston Seals are external seals. Piston Seals fit onto shafts with the sealing lip contacting the housing bore. Piston seals may also be known as Piston Packing. Piston Seals are mounted on a piston head which moves thru the bore of a hydraulic cylinder. Piston Seals can either be single acting or double acting seals. Piston Seals are usually used in conjunction with bearings and guide rings. Piston Seals are typically made of polyurethane but some piston seals can be made of fabric reinforced rubber.

DK101

DK102

DK102R

DK103

DK104

DK104R

DK105

DK106

DK107

DK108

DK109

DK109D

DK109H

DK109N

DK110-112

DK116

DK117

DK118

DK119

DK120

DK122

DK123

**OTHER PISTON SEAL STYLES**

 

A wiper, also known as a rod wiper, dust seal, excluder or scraper, is a ring in a cylinder that is used to wipe or scrape dirt from the rod or shaft. A wiper helps prevent dirt particles from entering the hydraulic system. A rod wipers main function is to keep the rod and cylinder clean and free from foreign matter preventing premature failure. The wiper is not a pressure sealing element. Wipers most commonly snap into a groove. Some other wipers are made to press into a groove, such as a metal clad wiper. A wiper seal can be made and can function as a wiper and a rod seal all in one groove where space is an issue.

DA101

DA102

DA103

DA104

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DA105

DA106

DA107

DA108

DA111

DA113

DA114

DA115

DA116

DA117

DA118

DA119

DA212

DA213

**OTHER WIPER SEAL STYLES**

 

Wear Rings are guiding elements that snap onto a shaft, both piston and rod, to keep metal from contacting metal that will damage and score the surface of a cylinder. Wear Rings help keep the cylinder from seizing up. Wear Rings are also know as wear bands, guide rings, wear guide rings, or bearings. Wear Rings have a durable wear rate and non-scoring properties. Wear Rings are made in inch and metric sizes. Wear rings are usually made of fine weave cotton fabric and phenolic resin. Wear Rings absorb transverse loads on the rod and improve the durability of packings in a hydraulic cylinder.

DF101

DF102

DF103

DF104

DF105

DF106

DF107

DF108

DFB102

**OTHER GUIDE & WEAR RING STYLES**

 

Back-up Rings are used in conjunction with O-Rings for both static and dynamic sealing applications. Back-up rings prevent extrusion of the o-ring when it is subjected to high pressures. Back-up rings help when the extrusion gaps are excessive. Two back-up rings should be used, one on each side of the o-ring, wherever possible. Back-up rings are washer like devices. Back-up rings are not seals themselves. Back-up rings are a support item like a spacer. Back-up rings are available in two designs, a flat washer style and a contoured style. Back-up rings may also be called buffer rings.

DST108

DST109

DST110

DST111

DST112

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DST113

**OTHER BACK-UP RING STYLES**

 

O-rings are a one piece object usually molded from elastomeric material. O-rings are in the shape of a torus (donut shape). O-rings can form a static or dynamic seal. A static o-ring seal is used for containing a pressure or maintaining a vacuum. Dynamic o-ring seals can be reciprocating or rotating. An o-ring, when installed, compresses and deforms slightly into the free space within the groove to form a proper seal. O-rings are capable of sealing thousands of PSI pressure. O-rings are one of the most common seals used in machine design. O-rings are one of the most inexpensive seals and easy to make. O-rings are reliable and have simple mounting requirements. And o-ring is measured by its inner and outer diameters. O-rings are described by material composition and hardness. O-rings are typically available in standard sizes per industry standards. O-rings are available in both metric and inch sizes. O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements, quality, quantity and cost. O-rings can also be machined with a CNC lathe.

DFL106

**OTHER O-RING STYLES**

 

**CLICK HERE FOR O-RING TECHNICAL INFORMATION**

 

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Pneumatic Sealing Technical Information