Adjustable stop for check valve

A pump comprising:

• a housing;
• a fluid passage extending through the housing from an inlet to an outlet;
• a pump mechanism disposed within the housing and configured to pump fluid from the inlet to the outlet;
• a check valve disposed in the fluid passage, the check valve comprising:
• a seat;
• a valve member separable from the seat over a gap;
• and
• a rod comprising:
• a first section extending from an exterior of the housing;
• a second section adjustably coupled to the housing;
• a third section extending into the fluid passage between the inlet and the outlet;
• a pump valve disposed within the rod to control fluid flow through the fluid passage;
• and
• a variable stop feature coupled to the third section to engage the valve member and change and thus a distance the valve member can travel from the seat.

A pump comprising:

• a housing;
• a fluid passage extending through the housing;
• a pump mechanism disposed within the housing and configured to pump fluid through the fluid passage;
• a check valve disposed in the fluid passage, the check valve comprising:
• a seat;
• a valve member separable from the seat over a gap, the valve member movable relative to the seat and configured to engage the seat to prevent fluid flow through the fluid passage;
• and
• a rod comprising:
• a first section extending from an exterior of the housing;
• a second section adjustably coupled to the housing;
• a third section extending into the fluid passage, the third section configured to engage the valve member to limit displacement of the valve member from the seat, the third section thereby defining and thus a distance the valve member can travel from the seat;
• and
• a pump valve disposed within the rod to control fluid flow through the fluid passage.