Automatic Reservoir Bleed valve0 pages

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	Pall Corporation Contact Us: www.pall.com/ccntact
	Automatic Reservoir Bleed (ARB) Valve

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Description

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Air causes problems if it is present in pressurised hydraulic systems.

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Normally, the maintenance ground crew purges the alrfrom the hydraulic

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system using bleed ports conveniently located on the circuit-on the

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pressurized reservoir or another high point, for example.

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The Pall ARB valve automatically bleeds the entrapped air or other gases

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from the hydraulic fluid reservoir as the system cycles through Its pressure

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envelope.

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Features

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Benefits

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How Does It Work?

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Applications

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Typical Part Numbers

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Features

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► Automatic air (and ether gases) bleed on each pressurlzaticn cycle.

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► Fits into most existing bleed ports

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► Working pressure up to 1500 kPA

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► Can be designed for use with a double pressure system [i.e., one where there is a planned reduction in

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hydraulic pressure after take-off)

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► Certified for military aircraft applications

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► Optimum Installation is with the valve mounted vertically In the top of the reservoir

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Ben efts

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► Improved hydraulic system performance

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► Reduction of ground and in-flight aborts

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► Reduced maintenance and associated costs

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► Shorter aircraft turn-around and response times

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► Compact S lightweight

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► Easy to install

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How Does it Work?

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There are 3 Stages of Operation:

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STAGE 1

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System at Rest

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► The Inlet pert Is closed.

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► A centralized piston is held in the 'full down" position by a spring.

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► This closes the valve and prevents any flow of air or oil.

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STAGE 2

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Air Bleed Phase

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► As the reservoir Is pressurized, trapped air or gas enters the valve through the Inlet port.

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► The air (gas)flows between the body and the piston to the outlet port.

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► The air Is then vented overboard into the atmosphere.

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STAGE 3

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Air Bleed Completed, System Pressurized

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► When all the air (gas) is expelled, hydraulic fluid enters the valve.

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