This new case study from Gallagher Fluid Seals outlines the benefits of using a PTFE spring energized seal in high friction applications.
Our customer is a manufacturer of power transmission products with a focus on magnetic force. Their product line includes magnetic capping heads, shaft couplings, current-controlled brakes, and clutches.
CUSTOMER PROBLEM:
The customer's magnetic clutch and was having design problems with high friction and break-away force, ultimately causing delayed production schedules.
As the name implies, these O-Rings are used to seal Straight Threaded Tube Fittings. As with otherO-Ringsin static application designs, they make a seal between two mating components. Unlike most O-Rings, they are not completely housed in a rectangular groove or gland. The threaded male tubing fittingdoescontain a radiused partial groove that retains the O-Ring. The mating part, typically a valve or cylinder port, has a chamfered face that compresses the O-Ring diagonally. The straight threads of both components allow the tube fitting to set completely, causing the O-Ring to be nearly fully compressed. This technique is often referred to as an O-Ring Boss system.
Sealing large joints or multiple grooves can pose cost and timing issues within product development. Extruded cord is often used to work within the program budgets and time constraints. However, that can create issues with splicing, RTV application, and inventory management.
To address these challenges, Parker has developed a new “Jigsaw” extruded seal design. The differentiating feature of this unique cross-section is the precise interlock when the cut-to-length seal ends are overlapped. When compressed, this patent pending interlock seals against itself and creates an RTV free joint.
Polyurethane (AU) seals are among the most versatile and durable materials used in fluid power sealing. They are cast into billets or molds to create the seals used in many of the hydraulic components you see every day, such as pump shaft seals, cylinder pistons and rod seals. The material benefits from man chemical formula types, providing a wide range of sealing characteristics to suit countless applications.
Formerly known as Simrit, but now Freudenberg Sealing Technologies (FST), the Disogrin® brand of polyurethane materials are FST's proprietary compounds used for fluid power seals.
Below are two of the most common polyurethane compounds used in the industry. This blog will discuss the application parameters and features and benefits of Disogrin 6865 and 9250.
Depending on the direction that squeeze is applied to the cross section on o-rings or seals, they will be categorized as an axial or radial seal.
Static Axial Seals
A static axial seal will act in a similar manner to a gasket that is squeezed on both the top and the bottom of an O-ring’s cross section. A static axial seal is used in face, or flange-type type applications. When it is used as a face seal and there is internal or external pressure, the O-ring should be positioned against the low-pressure side of the groove to cut down on O-ring movement and accompanying wear within the groove.
These seals are easier to design than static radial seals. This is due to the lack of extrusion gap and less design steps. That enables the user to more easily control the tolerances.
Spiral Failure, Explosive Decompression, Abrasion, Installation Damage, and other less common causes of O-Ring failure.
We are excited to present to you the final installment of the O-ring video webinar series. For this video, Ben Mell, Regional Sales Manager will discuss additional common types of failure modes. This continuation of October's failure mode video will take a deeper dive into the next four most common types of failure modes.
The humble O-Ring is, in simplest terms, a ring of rubber. A Spring Energized Seal consists of an engineered plastic jacket, usually a PTFE blend or UHMW-PE, and a metallic spring element. One is made in quantities of tens of thousands and then stocked on a shelf, one is machined and assembled per individual order.
While both are seals, their commonality in design, intent, and functionality is limited. The applications where each is successfully employed can be very different.
Optimal rubber seal performance is crucial for manufacturers and engineers. If for any reason the rubber seal malfunctions, it could result in anything from corrosion and water damage to weathering and loss of air/heat. Because of this, it is of the utmost importance to be aware of how temperature affects rubber seals.
This blog will discuss the affects that temperature can have on rubber. High temperatures and low temperatures will have different affects on performance.
What does a customer do when their application calls for enhanced performance that elastomers alone cannot offer? They turn to GFS partner, Parker Hannifin's uniquely formulated chemical bonding agents which enhance the performance of common elastomeric components by integrating them robustly with metal, thermoplastic, or other component substrates. Using world class process control during the elastomer’s vulcanization process, component substrates become integrally linked to the engineered elastomer, transforming them into a cohesive sealing system.
Part 5 - Basics of O-Rings - Intro to Failure Modes
We are excited to present to you part 5 of our O-ring webinar series. For this portion, Benjamin Mell, GFS Application Engineer and Regional Sales Manager, introduces you to O-ring failure modes. Ben will give a general overview of how and why an O-ring might fail, and how you can determine which kind of failure mode the seal experienced.
Then, Ben will dive into the first two O-ring Failure modes.