Cam Bearings Freeze

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Cam Bearings Freeze
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Many industries use specific valves, called pinch valves, to control fluids, wastewater, slurries, abrasives and corrosive chemicals. Pinch valves are constructed of a heavy-duty, rugged pinch mechanism that positions a sleeve. The valve offers maximum durability and ensures precise flow control in many industrial processes.

Inside every pinch valve is a sleeve that is crucial to the performance success of the valve. This sleeve enables a pinch valve to have a bi-directional, drop tight shut off with which to control flow. Most pinch valve sleeves are made of flexible elastomer compounds, many of which resemble rubber in composition and feel. Because a sleeve's composition is crucial to the success of the valve's application, valve manufacturers offer different elastomer options from which the sleeve can be constructed.

The many uses of the pinch valve

Because pinch valves are useful in a wide range of industries, the ability of a purchaser to choose the desired sleeve composition is paramount. Commonly used in the mining industry, a pinch valve's tough construction makes it ideal for use on harsh and abrasive mining slurries. Pinch valves can also be useful in demanding wastewater treatment applications. For example, a pinch valve's accurate, repeatable linear flow control and drop tight, bi-directional shut off make this valve type a good choice for sludge and raw sewage control.

In the power industry, pinch valves are an important component used in lime and ash handling - two tough services commonly found within a power plant. The abrasion-resistant, self-cleaning, and flexible elastomer sleeve of a pinch valve won't scale, bridge, plug or freeze on slurries. Pinch valves can also work in the treatment and handling of corrosive chemicals. Because there is no packing to maintain and no cavities, seats, or cam action to bind valve operation, pinch valves are often used in corrosive chemical applications.

Pinch valves can also be used in pulp and paper mills. Pulp stock, coating and recycled paper lines are some of the most difficult applications for a valve. The flexible elastomer sleeve of a pinch valve are able to withstand these abrasive services. Pinch valves can also be a great asset in food and beverage plants, cement/sand/silica factories, refineries, pneumatic conveying, and scrubbing.

A sleeve elastomer for every application

The multitude of uses for pinch valves require that purchasers be able to choose specific sleeve compositions and styles for various applications. A pure gum rubber sleeve, for example, is not suitable for the handling of strong acids, but might be appropriate for food manufacture or alcohol distillation. The application of a particular pinch valve, including the temperature range to which it will be exposed, dictates which sleeve elastomer a valve customer should choose.

Pure gum rubber sleeves are resilient and abrasion-resistant. They can handle an incredibly wide temperature range, from -50 F to 180 F, and they are extremely flexible, as well as non-marking. They are composed of natural rubber, and are most suitable for organic (or, carbon-based) acids, and mild chemical compounds, including alcohols. Strong acid and basic solutions, oils, and solvents are some of the chemicals that this type of pinch valve sleeve is ill-equipped to handle.

Neoprene pinch valve sleeves are synthetic rubber sleeves composed of chloroprene polymers. They handle a slightly wider temperature range than pure gum rubber sleeves do, working well with temperatures up to 220 F. Neoprene is chemically inert, and works best in the handling of moderate acids and other chemicals. Unlike pure gum rubber, it is strong and resilient enough to handle products containing ozone, as well as some oils and fats. Neoprene is more resistant to abrasion than is gum rubber; however, it can be eroded or weakened by oxidizing acids, ketone, ester, and chlorinated hydrocarbons.

Sleeves composed of chlorobutyl elastomers, or chlorinated butyl rubber compounds, handle major temperature ranges, from -60 F to 300 F. These sleeves are known for their good abrasion resistance and their ability to handle animal and vegetable fats. However, other types of oils are too heavy for chlorobutyl elastomers to handle -- as are solvents, which can break down the rubber.

The trademarked name of nitrile (a triple-bonded carbon-nitrogen compound), Buna-N can be used to make sleeves suitable for -40F to 240 F temperature ranges. These types of sleeves can be useful in chemical manufacture and chemical engineering because they can handle chemicals and solvents. They are not suitable, however, for ozone, ester, ketone, or nitro/chlorinated hydrocarbons. Meanwhile, Hypalon, a trademarked name for a chlorosulfonated polyethylene compound, is used to construct sleeves suitable for temperature ranges between -60 F and 275 F. This durable compound can handle quite strong acids and bases, as well as freon, ozone, alcohol compounds, and alkalines. This type of pinch valve sleeve should not be used with ketone, ester, or various aromatic and chlorinated hydrocarbons. Hypalon resists weathering quite well, however.

EPDM (or ethylene propylene diene monomer) valve sleeves are excellent for use with fats and oils. These valves -- made of the material used to seal vehicle doors, windows, and the like -- can withstand temperature ranges between -60F and 300F. They should not be used, however, to work with mineral oils or solvents. They also weather well. Viton, a type of synthetic rubber used commonly in O-rings, can also be used with animal and vegetable oils, as well as with acids. Though this type of sleeve performs poorly at temperatures lower than -10 F, it performs quite well at temperatures up to 400 F. Viton sleeves also display excellent tensile strength.

Each of the many uses of pinch valves requires careful consideration of the valve sleeve that is most appropriate to the process for which the valve will be used. With the variety of sleeve elastomer options available, it is no wonder that pinch valves are applicable in so many situations and for so many processes.

Red Valve, in Pittsburgh, Pennsylvania, manufactures custom pinch valves, including air operated, control, and manual pinch valves, along with pinch valve sleeves. For more information, visit Red Valve's Web site.

Self-lubricating, Nonmetallic Bearings Handle Tough Jobs

Self-lubricating bearings make sense when relubrication is difficult or when operating conditions compromise liquid lubricants. Such bearings can also eliminate the need for special lubricants in food-processing equipment.Self-lubricated, nonmetallic Duralon bearings, for instance, use a filament-wound fiberglass epoxy resin matrix with a woven bearing element of Teflon and polyester. The bearings can be made in numerous shapes and inexpensively customized to work in a wide range of conditions, including harsh industrial environments.

For example, pneumatic cylinders fitted with Duralon rod bearings operate a rotary valve actuator on machines that fill "tote tanks" with liquid chemicals including solvents, soaps, oils, vaporous liquids, waxes, and corrosives. The cylinders have successfully completed tests to 80 million cycles at 0.5-in. travel under various load conditions.

Another application for the bearings are in winches and sheaves used aboard large cruising and racing yachts. Here, lubrication can wash out because bearings constantly see fresh or saltwater at temperatures ranging from below freezing to tropical. In this environment, needle bearings tend to bind, while plastic bushings can swell and seize. The Duralon bearings tolerate the harsh conditions and reduce friction.

Self-unloading barges are yet another application for the nonmetallic bearings. The bearings support huge cylinders that position booms as they unload taconite, gravel, calcite, and other bulk mineral cargo. The combined weight of boom and cargo can reach nearly 200 tons.

Lifting and lowering the boom is a hydraulic cylinder mounted above it at the pivot end. The 21-in. bore 125-in. stroke cylinder, weighing more than 22 tons, attaches to the supporting structure by a yoke with a vertical pin. The vertical pin rotates on a Duralon bearing. The bearings see ambient temperatures from over 100°F to under 20°F, plus moisture and dust. The self-lubricating bearings reduce the amount of lubricant needed to prevent corrosion of the large-diameter shafts.

In another application, threesided square Duralon bearings are used in equipment that sprays lubricant on dies between casting cycles. The motor-driven unit moves aside for die removal and replacement. The portion of the machine and manifold supported by the bearings weighs about 500 lb.The previous design used a cam follower on which the upper part of the machine moved. However, the followers needed periodic lubrication. The open-square bearing, in contrast, needs no external lubrication. It rides on a 0.75-in.-square rail that bolts against a plate, which supports the rail along its length.A conveyor system uses hexagonal-shaped, nonmetallic bearings to eliminate a separate drive motor. The precision machines deliver plastic, multiwell vessels, from each of three conveyor lanes, to a multisyringe aspirate-dispense instrument.

A variable-speed dc motor drives the shuttle mechanism though a timing belt and hex shaft. Two 0.375-in. hex-bore Duralon bearings epoxy into a crowned aluminum drive tube. The tube slides along the stainlesssteel hex shaft. Linear travel speeds are about 24 ips. The hex bearings let the shuttle move perpendicular to the conveyor lanes and provide power at any point in its travel, without the weight and complexity of a drive motor on the shuttle itself. Less shuttle inertia shortens transfer times and boosts throughput. The self-lubricating bearing material meets critical outgassing specs as well.

Hydraulic cylinder rod ends are yet another application for the bearings. Here, spherical bearings combine with a splitsteel outer race to eliminate metal-tometal wear and galling. Dynamic load capacities to 30,000 psi are possible. Cylinders equipped with the bearings find use in construction equipment, agricultural vehicles, conveyors, packaging machinery, and scissors lifts. Mounted filament-wound bearings can fit round, square or hex shafts, in either two-bolt and fourbolt flange or pillow-block housings. Housings can be cast iron, stainless steel, or plastic. Various other bearing and ball-joint configurations are possible.

When selecting a self-lubricating bearing material, be sure to look at manufacturer test data and evaluate the material's B10 life. Rexnord has successfully tested Duralon bearings to 25 million cycles at a load of 4,000 psi, and 1,000,000 cycles at 20,000 psi, or about 8 longer than competitor composite bearings.

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About the Author

ARB Bearings Limited are proud to be one of the leading Ball bearing brand of India.  ARB Bearings  have achieved a new high by creating new ground of targets and quality.We are India's prominent engineering companies With a tremendous focus on manufacturing quality Ball Bearings and restrains on cost.

ARB Bearings Limited
Contact Person: Madan Singh
Mobile No: 9811313212
H-22, Udyog Nagar, Near Rohtak Road, Nangoli New Delhi- 110041, Delhi, India
Phone: 91-11-25471274 /
25471255 / 25186300
Fax: 91-11-25475455 / 25470126
Email: contact@arb-bearings.com
Website- http://www.arb-bearings.com

I want to rebuild my high mileage engine? Does anyone have advice?

GM V6 3.4L 207

is this a good price for a rebuild kit????????

Kit includes: Pistons, Rings, Gaskets, Cam Bearings, Rod Bearings, Main Bearings, Oil Pump, Freeze Plugs, Camshaft, Lifters, Pre-lube, and Timing Set, and Valley Pan (if applicable). Oversizes at no extra cost $535

It doesn't seem like a bad price for the kit but you should research different brands of kit some may have cheap chinese made parts that may be a good value but quality control seems be an issue for some chinese manufacturers. You should also take into account that you will need a cylinder hone an electric drill for the hone a piston ring compressor and technical manuals. To do it right you also need to have the engine block magna fluxed to check for cracks and bearing seats checked for straightness. The heads should also be checked for straightness and cracks, valves seals should be checked and valves should be checked and possibly ground. A machine shop will have to do these checks. I would advise disassembling the engine first and inspecting the cylinder walls for grooves if present the cylinders need to be bored to remove grooves and oversize rings will be needed. Crank shaft and cam shaft bearing seats should also be checked visually for grooves and if present will need to be machined and oversize bearings used.

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