In the following pages we present our size charts for our most popular hydraulic sealing products. They are considered to be multipurpose hydraulic seals and are designed for significantly improved performance. John crane is an american company, now a subsidiary of smiths group and provider of engineered products and services including mechanical seals, couplings, hydrodynamic bearings, seal support systems, filtration systems and artificial lift. Piston seals are used in hydraulic cylinder systems. In situations involving reciprocating, rotating, or oscillating motion relative to the seal, the oring application is dynamic. Aug 25, 2015 types of fittings and connectors some type of connector or fitting must be provided to attach the lines to the compo nents of the system and to connect sections of line to each other.
International iso and national din standards for seal housing dimensions are in place and should be considered. How to installing piston seal hydraulic cylinder cara. This seal design was amount the first single spring seals and proceeded the slightly less expensive type 21 seals. Hydraulic seals are generally relatively soft, nonmetallic rings captured in groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications. The parker polypak combines an oring type synthetic rubber ospring with a conventional liptype seal to produce a unique sealing device capable of sealing both vacuum, high and low pressure. Hydraulic cylinder seals are used to seal the opening between various components in the hydraulic cylinder. A hydraulic lift is a type of machine that uses a hydraulic apparatus to lift or move objects using the force created when pressure is exerted on liquid in a piston. It provides a tight hydraulic seal to the fluid which is more at the higher. Seal function the seal you require will usually be for the rod, ram, gland or piston and you may also require wipers or bearing strips. Trelleborg sealing solutions is a major international sealing force, uniquely placed to offer dedicated design and development. Type 1 elastomer bellows seals john crane mechanical seals. This includes orings, drings, backup rings, cover seals and gaskets.
Suitable for a wide range of service conditions ranging from water and steam to chemicals and corrosive materials, the type 1 mechanical seal is ideal for use in pumps, mixers, blenders, agitators, air. Improved performance for hydraulic seals from thermoplastic. These mechanical seal are a result of two decades of experience in design, manufacture and operation of seals. Mechanical seal technology and selection eagleburgmann. Imperfect mating parts require some type of sealing device to be inserted between them to seal against loss of liquid, gas or solid fluids or particles. Download ky type 109, john crane type 109, ptfe wedge mechanical seals. Find us in connellsville, pa and in shippenville, pa. Piston seals are dynamic seals, typically singleacting pressure acting on one side only and doubleacting pressure acting on both sides seals. Hydraulic cement is used widely in the construction industry sealing structures below grade and in situations where structures can be. Hydraulic seals hercules sealing products cylinder repair. The seal is pressfit into a housing bore with the sealing lip contacting the shaft. With a lower k value, the safety against thermal overload will increase, but the mechanical seal may also lift off more easily.
Dynamic seals they seal between components in relative motion. Mechanical seals are classified by arrangement, configuration. There are two main types of hydraulic seals in the system. The rod seal is the most critical seal on any type of fluid power equipment preventing. To install a seal, the pump would have to be taken offline and disassembled. Selection considerations page in the back of this catalog is used in the seal. In order to control the hydraulic outputs, different types of control. Rod seals types of hydraulic seals standard and non. A hydraulic seal is a relatively soft, nonmetallic ring, captured in a groove or fixed in a combination of rings, forming a seal assembly, to block or separate fluid in reciprocating motion applications.
Our product portfolio includes everything from mechanical seals and seal supply systems to magnetic couplings, carbon floating ring. Hydraulic pumpmotor division hydraulic flow is developed as the pump rotating group is driven by a prime mover hydraulic pump basics fluid is forced out of pump at the pump outlet a partial vacuum is created at the pump inlet and atmospheric pressure forces fluid into pump from the reservoir. Hydraulic seals can be damaged if they are not correctly installed. Lets examine some specific types of seals in each category. Loaded lip seals are very versatile and can be used as rod seals or piston seals. A wide range of groove configurations and sealing profiles allow gallagher engineers to match your hydraulic sealing application with the optimal sealing system. Mechanical seals are generally classified by arrangement and configuration. The choice of piston seal is determined by the way in which the cylinder operates. Review different pump types commonly used understand the difference between centrifugal pumps and positive displacement pumps understand the working principle of the tuthill. Hydraulic hose seals metric hydraulic seals cumberland. This paper describes the potential of a new thermoplas. From many years of application experience with sealing hydraulic equipment. Hydraulic seals hercules sealing products has the largest selection of seals in the industry, with repair parts for over 150 equipment brands such as caterpillar, john deere, komatsu, case, volvo and many more.
Hydraulic sealing systems are used in a wide range of differ. It is a type of cement, similar to mortar, that sets extremely fast and hardens after it has been mixed with water. A seal that is not subjected to any type of movement when pressurized. One of the simplest examples of a static seal is the oring. A liptype mechanical seal may only require static secondary seals because the deflection of the liptype seal accommodates equipment operating motion. Hydraulic seals are manufactured in three common types of materials, i. Static seals are categorized as either axial or radial, depending upon the direction in which squeeze is applied to the orings cross section. Hydraulic seal selection guide six simple steps to seal selection to select the correct hydraulic seal for your application, please consider the following steps. Check that the seal is of the correct type, part number, and size, and that the. Plan 41 recirculation from the pump discharge through a cyclone separator delivering the clean fluid to a cooler and then to the seal chamber. There are many dif ferent types of connectors and fittings provided for this purpose.
A great choice for applications with nonadjustable housing. Hydraulic cement is a product used to stop water and leaks in concrete and masonry structures. Common sealing orientation and directions for hydraulic seals and pneumatic seals include internal or rod seal, external or piston seal, symmetric seal, and axial seal. John crane type 109, ky type 109, ptfe wedge mechanical seals. Plan 32 injection of clean fluid into the seal chamber from an external source. Mechanical seal handbook pdf get file mechanical seal handbook pdf. Machined grooves in the cylinder piston allow the piston ring to seal directly against the cylinder bore. Their use is critical in providing a way for fluid power to be converted to linear motion.
Hydraulic seals types hydraulic seals and pneumatic seals are designed as per the cylinder working pressure, cylinder speed, operating temperature, working medium and application. Sealing devices offers many types of seals from orings that seal water, aircraft fuels and many media on pumps, electronic devices. Bunafabric, and buna type wpdbu, deep base wpacking, can be used in similar applications as standard wpacking. Ucup style buffer ring offers an asymmetric sealing lip profile, champhered sealing edges, and pressure relieving capabilities to prevent inner pressure entrapment when employed in a tandem sealing system.
The chapter describes mechanical shaft seals used in grundfos pumps as examples of the variety of shaft seal solutions for different applications. For the production of hydraulic seals, the fabric is impregnated with an nbr elastomer solvent. Unlike an oring seal, the hydraulic diameter of a bellows seal is not a fixed geometric value. Seal application installation technicaldata material type page fieldofapplication function. September 26, 2012 by paul heney leave a comment sealing is a vital factor in the proper function of hydraulic applications, as leakage from the cylinder or across the piston, along with the ingress of unwanted contaminants, decrease the lifespan and efficiency of the entire application. Improved performance for hydraulic seals from thermoplastic polyurethane rolf gallegutbrecht, holger jordan and renate brielmann management summary seal design engineers and end users are continually seeking improved sealing systems and materials. Rubber hydraulic seals, v seals, wiper seals sealing devices. We have two convenient locations in pennsylvania to better serve you. Function hydraulic lift technology has a multitude of industrial applications, like construction. These seal are best suitable for application involving abrasive, corrosive and viscous fluids. Singleacting pistons only contain pressure on one side of the piston. Mechanical shaft seal types in this chapter, the basic working principles for single mechanical shaft seals will be put into a practical context. Hydraulic sealing products size charts this document should be used in conjunction with the latest version of our hydraulic sealing guide.
Hydraulic seals types and definitions standard loaded lip seal. Orings are very versatile and available in various sizes. We know you take cases like this very seriously, and so do we. Hydraulic seals are generally relatively soft, nonmetallic rings captured in groove or fixed in a combination of rings, forming a seal assembly, to block or separate. Sing e seals can be used or they can be stacked into sets. The wide variety of seal types is due to the diversity of applications each utilizing different machinery, fluids and processes.
In addition to our inventory of hydraulic seals we also have a variety of hydraulic hoses and adapters available for you to purchase. Hydraulic seals standard loaded lip seal ucups rod. Single acting piston seals piston seals or piston rings are used in hydraulic cylinders for fluid sealing. Mechanical seal working animation types of mechanical seal. Mechanical shaft seal types and sealing systems 26 1. Wipers, scrapers or protector bellows machining information. Pdf download jul 12, 2017 seals play an important role in hydraulic cylindersthey contain the fluid and prevent the leakage of fluid between components. Multiple seals are captured in a groove and are fixed on top of each other to form a seal assembly for the hydraulic equipment. Feb 25, 2016 hydraulic seals are available in so many types.
With its proven track record of exceptional performance, the type 1 elastomer bellows seal is widely recognized as the industrys workhorse. A good working knowledge of available seal optionsand what ultimately. Figu r e 3 shows an example of the seal and guide components of a heavy duty cylinder. Packing although mechanical seals had been around for many decades, by 1955 industry had converted only a small percentage of pumps from packing to mechanical seals. What types of seals are used in hydraulic cylinders. Seals prevent or reduce fluid passage between 2 surfaces. Hydraulic rod seals rod seals are used in hydraulic cylinders for fluid sealing. Hydraulic seals and pneumatic seals selection guide.