Combination flow control valve and reverse flow check valve

A combination flow control valve and reverse flow check valve comprising:

• a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end;
• a shiftable valve element positioned within the housing for controlling the flow of liquid through the channel;
• and
• a check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow for inhibiting backflow of liquid through the channel and past the shiftable valve element, wherein said check element is substantially spherical.

A combination flow control valve and reverse flow check valve comprising:

• a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end, the housing including a circumferentially-extending shoulder extending radially inwardly in the channel, the shoulder defining a substantially circular opening presenting a seat, the seat having a first diameter;
• a shiftable valve element positioned within the housing for controlling the flow of liquid through the channel;
• a spherical check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow and configured for engaging the seat for inhibiting backflow of liquid through the channel and past the shiftable valve element;
• and
• a check element retainer located proximate the desired downstream outlet end of the housing and positioned in the channel for maintaining the spherical check element in the housing.

A reservoir for holding fluid, the reservoir comprising:

• a tubulation adapted to discharge fluid from the reservoir;
• and
• a combination flow control valve and reverse flow check valve mounted to the tubulation, the combination flow control and reverse flow check valve including:
• a housing defining a central, fluid conveying channel therethrough, wherein the channel extends longitudinally along an axis from a desired upstream opening end to a desired downstream outlet end;
• a shiftable valve element positioned within the housing for controlling the flow of liquid through the channel;
• and
• a check element positioned within the housing in a downstream position relative to the shiftable valve element in regard to a desired direction of flow for inhibiting backflow of liquid through the channel and past the shiftable valve element.