Hydraulic Diaphragm Accumulators

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Hydraulic Diaphragm Accumulators

The hydraulic diaphragm accumulator consists of halves screwed or bolted together. A synthetic rubber diaphragm is installed between both halves, making two chambers. Two connection ports are threaded in both halves. The top opening is fitted with a screen disc to prevent the diaphragm from rupturing when system pressure is depleted. The air valve is …

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Hydraulic Piston Accumulator

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Hydraulic Piston Accumulator

Hydraulic piston accumulator consists of a barrel as body, heads and piston. The piston may be extended with a tail rod; the piston without a tail rod is referred to as a floating piston. Hydraulic fluid is pumped into one end of the cylinder and the piston is forced toward the opposite end of the …

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Hydraulic Bladder Accumulator

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Hydraulic Bladder Accumulator

A bladder accumulator is constructed by entering a flexible bladder inside a shell. The hydraulic bladder accumulator has a larger diameter at the top and smaller at the bottom. The bladder bag is made from synthetic rubber which is thinner at the top than at the bottom. The accumulator work on Barlow’s formula which states: …

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Hydraulic Pilot Operated Relief Valve

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Hydraulic Pilot Operated Relief Valve

The direct acting and pilot operated relief valve have a different pressure vs. flow curve although both of them perform the same function. The pilot operated relief valve allows the operation over a wider pressure range. The figure above shows the functional diagram of pilot-operated relief valve. The orifice on the main spool balanced the …

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Cooling Hydraulic Oil

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Cooling Hydraulic Oil

Hydraulic oil is cooled by a heat exchanger, there are 2 type of hydraulic oil heat exchanger: shell-and-tube and finned tube. The shell-and-tube heat exchanger consists of series of tubes inside a closed cylinder. The hot hydraulic oil flows through these tubes with the cooling fluid flows around the tube to receive the heat. The …

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Bendix Hydro Boost Brake System

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Bendix Hydro Boost Brake System

Bendix hydro boost brake system was designed by Bendix Corporation to simplify the engine compartment. The figure above shows the Bendix hydro boost brake system schematic. The basic system consists of an open center spool valve and a hydraulic cylinder assembled in a single unit. The oil pressure is provided by power steering pump. Hydro-boost …

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Pressure Control Valves in Hydraulic Circuit

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Pressure control is the most important element in hydraulic circuit. Hydraulic components are designed to operate on a specific pressure range with capability to withstand some burst peak pressure. These components can be damaged if the working pressure exceeds its maximum pressure for a long period of time. The damage can injure nearby workers or …

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Hydraulic Counterbalance Valves

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Hydraulic Counterbalance Valves

A counterbalance valve opens a free flow in one direction while regulating the opposite flow until a certain pressure is reached. Counterbalance valve typically installed in line between directional control valve and a vertically mounted hydraulic cylinder actuator. Counterbalance valve act as a hydraulic restrictor to hydraulic cylinder. For example, a counterbalance valve is used …

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Hydraulic Poppet Valves

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Hydraulic Poppet Valves

A poppet valve consists of movable poppet which closes against a valve seat. The inlet pressure will hold the valve on closed position. The poppet will open if the poppet stem is applied by a small force. The poppet stem is equipped with an O-ring to prevent oil leakage. The number of poppet in a …

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