Balanced piston fluid valve

Balanced fluid valving method, comprising the steps of

• forming a passageway as a bore with a cylindrical wall in a valve housing and providing position-adjustment means for moving valve members therein into and away from mutually seated contact,
• providing therein an annular barrier as an outer piston-like valve member fitting slidably along the cylindrical wall and being hollowed internally about the axis.
• providing therein a coaxial core barrier as an inner piston-like valve member fitting slidably along and partially within the hollowed interior of the outer piston-like valve member and about the axis, and
• providing seats on the piston-like valve members adapted to be moved by the position-adjustment means into mutual seated sealing contact so as to preclude fluid flow therethrough in the closed position and alternatively moved away from said contact so as to allow fluid flow therethrough in open position.

Balanced fluid flow-controlling valve mechanism comprising

• coaxial valve members mutually seated against one another in closed position and mutually unseated in open position, and
• a housing with a fluid inlet and a fluid outlet interconnected by an axial bore containing the coaxial valve members, including
• a piston-like outer valve member fitting within the bore and movable therealong between limited upstream and downstream positions and obtruding a peripheral annular extent of the bore cross-section but not obtruding a complementary core extent of the bore cross-section, and
• a piston-like inner valve member fitting within the outer valve member and movable therealong between mutually seated limited up-stream and downstream positions, and adapted when seated to obtrude the cross-sectional core extent of the bore complementary to the cross-sectional annular extent of the bore obtruded by the outer valve member,
• the outer and inner valve members being adapted, by being mutually seated in the closed position, to obtrude the entire crosssectional extent of the bore and thus prevent flow therethrough, and further adapted by being mutually unseated, in the open position, to obtrude only part of the bore cross-sectional extent and thereby to allow flow through the unobtruded cross-sectional extent thereof;
• and adjusting means adapted to move the outer and inner valve members axially along the bore in opposite directions to and from the mutually seated closed position and the unseated open position.

Balanced fluid flow-controlling valve mechanism comprising

• coaxial valve members mutually seated against one another in closed position and mutually unseated in open position, and
• a housing with a fluid inlet and a fluid outlet interconnected by an axial bore containing the coaxial valve members, including
• a piston-like outer valve member fitting within the bore and movable therealong between limited upstream and downstream positions and obtruding a peripheral annular extent of the bore crosssection but not obtruding a complemetary core extent of the bore cross-section, and
• a piston-like inner valve member fitting within the outer valve member and movable therealong between mutually seated limited upstream and downstream positions, and adapted when seated to obtrude the cross-sectional core extent of the bore complementary to the cross-sectional annular extent of the bore obtruded by the outer valve member,
• the outer and inner valve members being adapted, by being mutually seated in the closed position, to obtrude the entire cross-sectional extent of the bore and thus prevent flow therethrough, and further adapted by being mutually unseated, in the open position, to obtrude only part of the bore cross-sectional extent and thereby to allow flow through the unobtruded cross-sectional extent thereof;
• and adjusting means adapted to move the outer and inner valve members axially along the bore in opposite directions to and from the mutually seated closed position and the unseated open position, including spring means bearing against and thereby adapted to bias one of the valve members toward closed position only.

Balanced fluid flow-controlling valve mechanism comprising

• coaxial valve members mutually seated against one another in closed position and mutually unseated in open position, and
• a housing with a fluid inlet and a fluid outlet interconnected by an axial bore containing the coaxial valve members, including
• a piston-like outer valve member fitting with the bore and movable therealong between limited upstream and downstream positions and obtruding a peripheral annular extent of the bore crosssection but not obtruding a complementary core extent of the bore cross-section, and
• a piston-like inner valve member fitting within the outer valve member and movable therealong between mutually seated limited upstream and downstream positions, and adapted when seated to obtrude the cross-sectional core extent of the bore complementary to the cross-sectional annular extent of the bore obtruded by the outer valve member,
• the outer and inner valve members being adapted, by being mutually seated in the closed position, to obtrude the entire crosssectional extent of the bore and thus prevent flow therethrough, and further adapted by being mutually unseated, in the open position, to obtrude only part of the bore cross-sectional extent and thereby to allow flow through the unobtruded cross-sectional extent thereof;
• and adjusting means to move the outer and inner valve members axially along the bore in opposite directions to and from the mutually seated closed position and the unseated open position, including a rack on the outer valve member, a rack on the inner valve member, and a pinion interconnecting the two racks and adapted to be turned from outside the valve housing and thereby position the valve members axially relative to one another.

Balanced fluid flow-controlling valve mechanism comprising coaxial valve members mutually seated against one another in closed position and mutually unseated in open position, and

• a housing with a fluid inlet and a fluid outlet interconnected by an axial bore containing the coaxial valve members, including
• a piston-like outer valve member fitting within the bore and movable therealong between limited upstream and downstream positions and obtruding a peripheral annular extent of the bore cross-section but not obtruding a complementary core extent of the bore cross-section, and
• a piston-like inner valve member fitting within the outer valve member and movable therealong between mutually seated limited upstream and downstream positions, and adapted when seated to obtrude the cross-sectional core extent of the bore complementary to the cross-sectional annular extent of the bore obtruded by the outer valve member,
• the outer and inner valve members being adapted, by being mutually seated in the closed position, to obtrude the entire cross-sectional extent of the bore and thus prevent flow therethrough, and further adapted by being mutually unseated, in the open position, to obtrude only part of the bore cross-sectional extent and thereby to allow flow through the unobtruded cross-sectional extent thereof;
• and adjusting means adapted to move the outer and inner valve members axially along the bore in opposite directions to and from the mutually seated closed position and the unseated open position;
• wherein the housing includes also a bore substantially perpendicular to and intersecting the axial bore, and wherein the outer piston-like member has an opening through an intermediate portion of itself adapted to communicate with the intersecting bore in mutually seated and unseated positions of the piston-like outer and inner valve members, whereby fluid may be exhausted to the exterior to urge the valve members together and close the valve or fluid may be supplied from the exterior to urge the valve members further apart.