Category: Hydraulic Valve

Jet Control Valves

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Jet Control Valves

The principle of converting pressure into kinetic energy and then reconverting this energy into a controlled pressure can be utilized as a control means. The various types of jet control valves use this mode of operation. Proportional control is obtained beither deflecting or directing the high-velocity stream of fluid in relationship t.o a fixed receiving …

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Four-way Flapper-nozzle Control Valve

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Four-way Flapper-nozzle Control Valve

The four-way flapper-nozzle valve has two identical hydraulic circuits, one supplies flow and pressure to one side of an actuator, the other circuit supplies the hydraulic fluid to the other side of the actuator. In other words l the valve provides proportional push-pull control to the actuator. The common point of the two circuits is …

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Three-way Flapper-nozzle Control Valve

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Three-way Flapper-nozzle Control Valve

The flapper-nozzle valve has certain mechanical design advantages mainly the simpler construction and the feature of no close-clearance sliding parts as compared to the spool-type valves. However, flapper nozzle valves must be very .accurately designed to provide characteristics which exactly suit the requirements of a particular application. Figure 1.24 shows a three-way flapper-nozzle control valve. …

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Two-way Valve Constant-flow Source Characteristic

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Two-way Valve Constant-flow Source Characteristic

The two-way valve is merely a throttling valve having one variable-area orifice. When used in conjunction with a constant-flow source, the two-way valve can be used to position a piston actuator &s shown by Fig. 1.22. As indicated, a return spring or an external force is required to return the piston in the one direction. …

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Four-way Open-center Hydraulic Valve

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Four-way Open-center Hydraulic Valve

When a valve is designed to use a constant-flow source of fluid, the valve does not have its cont.rolling edges covering their corresponding port edges. Instead, each port edge is uncovered in the centered valve position. This type of valve is then said to be underlapped or open-centered as shown by Fig. 1.15. When the …

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Gear-Type Flow Divider Valve

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Gear-Type Flow Divider Valve

The gear-type flow divider valve works like two hydraulic gear motors with attached shafts. The both motor must have to run at the same speed since their shafts are attached. Thus, the same flow goes through both sides. The flow is equally divided and the cylinders actuator extends simultaneously. Gear-type flow divider has a pressure …

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Hydraulic Sliding Spool Valve

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Hydraulic Sliding Spool Valve

The figure above shows a hydraulic sliding-spool valve. The piston inside the valve slides back and forth to block and release ports in the housing. This valve sometimes called as a piston type spool valve, the sliding-spool valve has a piston of which the inner areas are equal. The hydraulic oil pressure from the inlet …

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Hydraulic Flow Control Valves

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Hydraulic Flow Control Valves

A hydraulic flow control valve is a device used for adjusting or manipulating the hydraulic oil flow rate. The hydraulic flow control valve constructs of a flow passage or a port whose flow area can be varied. Most common applications of flow control valves in hydraulic systems are in controlling the hydraulic oil flow rate …

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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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