초록 ▼

A sealing arrangement for a reciprocating piston pump utilizing at least two sets of seals separately supported at spaced apart locations along the length of the pump cylinder. One of the sets of seals located rearwardly from the other with respect to the discharge end of the pump cylinder is enclos

A sealing arrangement for a reciprocating piston pump utilizing at least two sets of seals separately supported at spaced apart locations along the length of the pump cylinder. One of the sets of seals located rearwardly from the other with respect to the discharge end of the pump cylinder is enclosed within a chamber formed by a sleeve positioned around the pump plunger. This rearward set of seals is hydraulically pressurized radially inwardly by the aforesaid sleeve during the discharge stroke of the plunger, thereby creating a sealing clearance which is kept constant and providing an accurate and effective seal.

대표청구항 ▼

In a high pressure piston pump, an improved sealing means in a clearance space between a cylinder and a plunger reciprocally movable therein comprising: a first set of high pressure seals positioned forwardly in the direction of the discharge stroke of the pump plunger towards the discharge end of t

In a high pressure piston pump, an improved sealing means in a clearance space between a cylinder and a plunger reciprocally movable therein comprising: a first set of high pressure seals positioned forwardly in the direction of the discharge stroke of the pump plunger towards the discharge end of the cylinder; a second set of high pressure seals separately supported at a spaced-apart location from said first set of seals, rearwardly along the length of the pump cylinder with respect to the discharge end thereof; and a sleeve around the pump plunger inside of the pump cylinder having a predetermined annual clearance space around its external circumferential surface, and said sleeve defining a chamber around the plunger within which said second set of seals are enclosed, and said sleeve being in fluid communication with the pressurized fluid medium being pumped on both its internal and external surfaces, whereby said sleeve and said second set of seals enclosed therein are hydraulically pressurized radially inwards during the discharge stroke of the pump plunger.