Check valve and shut-off reset device for liquid delivery systems

A liquid check valve comprising:

• a valve body defining a liquid flow path through a central longitudinal chamber having a first end and a second end;
• the valve body including a seal within the central chamber adjacent the first end;
• a sealing ball captively held within the central chamber between the second end and the seal, the sealing ball sized fit within the central chamber to move laterally within the central chamber while permitting liquid to move through the central chamber about the sealing ball from the first end toward the second end;
• the sealing ball sized to cooperate with the seal to prevent movement of liquid through the check valve when the sealing ball engages the seal, and wherein flow of a liquid into the central chamber from the second end toward the first end will urge the sealing ball against the seal;
• a slider within the central chamber holding the sealing ball in place, the slider configured to allow liquid to flow through the central chamber and about the sealing ball, the slider held between the seal and a shoulder within the central chamber and urged by a spring away from the seal toward the shoulder with a corresponding shoulder of the slider engaging the shoulder of the central chamber when no pressure from liquid is exerted against the slider to overcome the spring force;
• wherein pressure from liquid flowing through the central chamber presses the slider toward the ball and moving the shoulder of the slider out of engagement with the shoulder of the central chamber so that liquid may flow between the shoulders;
• the shoulder of the slider including a plurality of recesses that are positioned to not engage the shoulder of the central chamber when the shoulders are engaged, the recess positioned to increase the area between an outer surface of the slider and a wall of the central chamber when the shoulders are disengaged from each other.

A valve assembly comprising:

• a shut-off valve assembly including a body;
• a second assembly within which a portion of the body is received and including a seal adjacent the body;
• the assemblies cooperating to define a first end and a second end with a central axial passage extending therebetween, the passage including a slide receiving area which defines a greater diameter than the first end, with a shoulder formed between the slide receiving area and the first end;
• a slide positioned within the slide receiving area, the slide urged toward the first end by a spring positioned between the slide and the seal;
• the slide including an outer surface defining a smaller diameter than an inner surface of the slide receiving area, the outer surface including a plurality of extensions from the outer surface configured to engage the inner surface of the slide receiving area and to centrally position the slide within the slide receiving area, the slide defining a central opening within which a sealing member may be received and movable between an open position disengaged from the seal and a closed position engaging the seal preventing flow through the central axial passage;
• the slide further including a shoulder configured to engage the shoulder of the central axial passage and prevent movement of fluid through the passage and defining an interior hollow passage which is in fluid communication with the central axial passage by an opening, with the spring urging the slide toward the first end with the shoulder of the slide engaging with the shoulder of the central axial opening;
• the shoulder of the slider further comprising a plurality of recesses that do not affect the engagement of the shoulder of the slider and the shoulder of the central axial passage but which increases the space between the shoulders when the shoulder are not engaged with each other;
• wherein when the sealing member is displaced from the seal and liquid entering the first end is sufficiently pressurized to overcome the spring, the shoulders are moved from engagement and liquid flow is permitted from the first end between the body and the inner surface of the slide receiving area through the seal toward the second end;
• and,
• wherein gas bubbles present in liquid flowing into the slide receiving area through the first end may enter the central opening of the sliding portion and urge the sealing member into engagement with the seal, blocking liquid flow through the central axial passage.