US 5,399,071 AGranted

Pressure booster

OwnerMoshe Abraham, Zeev Stahlinventors

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Abstract

A liquid pressure booster includes a head member with a low-pressure inlet connectable to a liquid source at mains pressure, a high-pressure outlet connectable to the object to be tested, and a central bore, a compound cylinder constituted by a first, upper, relatively small-diameter portion fluid-tightly attached to the head member and a second, lower, relatively large-diameter portion contiguous with the upper portion and closed off at its lower end by a bottom plate having a drain opening. The booster further includes a hollow compound piston having two active portions: a first portion fitting, and movable in, the first cylinder portion, and a second portion, contiguous with the first portion, fitting, and movable in, the second cylinder portion, a central valving bar movable in reciprocating translation between first and second positions, a bistable valving sleeve movable between first and second positions, a first spring for biasing the compound piston towards the bottom plate and a second spring for producing a snap-action impulse causing the bistable valving sleeve to alternate between the first and second positions.

Claims14

Dependent claims

A liquid pressure booster, comprising:

a head member with a low-pressure inlet connectable to a liquid source at mains pressure, a high-pressure outlet connectable to an object to be tested, and a central bore;
a compound cylinder constituted by a first, upper, relatively small-diameter portion fluid-tightly attached to said head member and a second, lower, relatively large-diameter portion contiguous with said upper portion and closed off at a lower end by a bottom plate having a drain opening;
a substantially hollow compound piston having two active portions:
a first, relatively small-diameter portion fitting, and movable in, said first cylinder portion and adapted, when acting, to produce a relatively high pressure, and a second, relatively large-diameter portion, contiguous with said first portion, fitting, and movable in, said second cylinder portion, and adapted to be acted upon by a relatively low pressure;
a central, at least partly hollow, valving bar actuatable from outside of said head member and movable in reciprocating translation between a first and a second position;
a bistable valving sleeve slidably seated on said valving bar and movable in reciprocating translation between a first and a second position;
first spring means for biasing said compound piston towards said bottom plate;
second spring means for producing a snap-action impulse causing said bistable valving sleeve, in dependence of, and in coordination with, the movement of said compound piston, to alternate between said first and said second positions.

5 more elements

A liquid pressure booster, comprising:

a head member with a low-pressure inlet socket connectable to a liquid source at mains pressure, and a high-pressure outlet socket connectable to an object to be tested;
a compound cylinder constituted by a first, relatively small-diameter portion and a second, two-part, relatively large-diameter portion, the upper one of said two parts carrying said head member to which said first, small-diameter portion is tightly attached, the lower one of said two parts having a bottom surface;
a compound piston constituted of two active portions:
a first, substantially hollow, relatively small-diameter portion fitting, and slidable in, said first cylinder portion, and a second, relatively large-diameter portion movable in said second-cylinder portion, with the large-diameter piston portion dividing said second, large-diameter cylinder portion into a pressurizable chamber on the one hand, and into a vented chamber communicating with the atmosphere, on the other;
first valve means located on top of said head member and having at least two discrete, optional positions, in the first of which positions said first valve means connects said low-pressure inlet socket via said high-pressure outlet with said object to be pressure-tested to the exclusion of said compound cylinder, and in the second of which positions said first valve means connects said low-pressure inlet socket with said pressurizable chamber;
second, bistable valve means mounted on said large-diameter portion of said compound piston and flippable between a first position and a second position;
first flexible ducting means connecting said low-pressure inlet socket with an inlet port of said second valve means, and
second flexible ducting means connecting an outlet port of said second valve means with the atmosphere.

5 more elements

Dependencies are inferred from the claim text.