Air-operated high-temperature corrosive liquid pump

In an air operated liquid pump having a center body member having liquid inlet and outlet passageways and air inlet and outlet passageways,

• at least a pair of opposed bellows pumping members mounted on opposite faces of said center body member and each bellows pumping member compressible toward said center body member by air in an associated bellows compressing chamber,
• and means for passing air sequentially first to one and then to the other of said bellows compression chambers for successively pumping liquid first from one and then the other of said bellows pumping members,
• the improvement comprising liquid inlet ball valve means on each of said center body opposite face sides connecting said liquid inlet passageway to said pumping chambers,
• said ball valve means including a conically caged chamber extending from a valve seat for a ball,
• said chamber having an upwardly inclined surface and a valve cap partially closing said chamber and capturing said ball in said chamber.

An air operated liquid pump comprising, in combination:

• a center body member having liquid inlet and outlet passageways and air inlet and outlet passageways,
• at least a pair of opposed bellows pumping members mounted on opposite faces of said body member and each bellows pumping member compressible toward said center body member by air in an associated bellows compressing chamber,
• means for passing air sequentially first to one and then to the other of said bellows compression chambers for successively pumping liquid first from one and then the other of said bellows pumping members,
• a pair of sleeves each surrounding and connected to one of said bellows pumping members at the end thereof remote form said body member,
• said center body member having a plurality of bores therethrough aligned with the inner ends of said sleeves and
• a plurality of push rods extending through said bores between said inner ends of said sleeves
• whereby the movement of the sleeves connected to one bellows pumping member being compressed toward said center body member moves said push rods and moves the other bellows pumping member away from said center body member.

An air operated liquid pump comprising, in combination:

• a center body member having liquid inlet and outlet passageways and air inlet and outlet passageways,
• at least a pair of opposed bellows pumping members mounted on opposite faces of said center body member and each bellows pumping member compressible toward said center body member by air in an associated bellows compression chamber,
• means for passing air sequentially first to one and then to the other of said bellows compression chambers for successively pumping liquid first from one and then the other of said bellows pumping members,
• said means for passing air including means for passing cool air over the convolutions of said bellows,
• a pair of sleeves each surrounding and connected one of said bellows pumping members at the end thereof remote form said center body member,
• said center body member having a plurality of bores therethrough aligned with the inner ends of said sleeves and
• a plurality of push rods extending through said bores between said inner ends of said sleeves whereby the movement of the sleeve connected to one bellows pumping member being compressed toward said center body member moves said push rods and moves the other bellows pumping member away from said center body member,
• said means for passing cooling air including for each bellows pumping member at least one vent tube projecting from the center body and aligned with the inner end of said sleeve connected to said pumping member whereby movement of the sleeve toward said center body member at least partially blocks the flow of air through the vent tube to increase the pressure in said vent tube.

An air operated liquid pump comprising, in combination:

• a center body member having liquid inlet and outlet passageways and air inlet and outlet passageways, at least a pair of opposed bellows pumping assemblies each mounted on an opposite face side of said center body member for producing bellows pumping reciprocation back and forth together, each pumping assembly including
• a cylinder open at one end which is connected to said center body member and closed at the other end,
• a sleeve sealably slidable in said cylinder, and
• a bellows positioned within said cylinder and having an open end which is sealably connected to said center body member and a closed end which is connected to said sleeve forming a compressible pumping chamber within said bellows,
• said sleeve and said connected closed end of said bellows closing off a compression chamber at the closed end of said cylinder and forming a sliding piston for collapsing said bellows and pumping liquid out of said pumping chamber.

An air operated liquid pump comprising, in combination:

• a center body member having liquid inlet and outlet passageways and air inlet and outlet passageways, p1 at least a pair of opposed bellows pumping assemblies each mounted on an opposite face side of said center body member for producing bellows pumping reciprocation back and forth together, each pumping assembly including
• a cylinder open at one end which is connected to said center body member and closed at the other end,
• a sleeve sealably slidable in said cylinder, and
• a bellows positioned within said cylinder and having an open end which is sealably connected to said center body member and a closed end which is connected to said sleeve forming a compressible pumping chamber within said bellows,
• said sleeve and said connected closed end of said bellows closing off a compression chamber at the closed end of said cylinder and forming a sliding piston for collapsing said bellows and pumping liquid out of said pumping chamber,
• said center body member having a plurality of bores therethrough aligned with the inner ends of said sleeves and
• a plurality of push rods extending through said bores between said inner ends of said sleeves whereby the movement of the sleeve connected to one bellows pumping member being collapsed moves said push rods and moves the other bellows pumping member away from said center body member.

An air operated liquid pump comprising, in combination:

• a center body member having liquid inlet and outlet passageways and air inlet and outlet passageways, p1 at least a pair of opposed bellows pumping assemblies each mounted on an opposite face side of said center body member for producing bellows pumping reciprocation back and forth together, each pumping assembly including
• a cylinder open at one end which is connected to said center body member and closed at the other end,
• a sleeve sealably slidable in said cylinder, and
• a bellows positioned within said cylinder and having an open end which is sealably connected to said center body member and a closed end which is connected to said sleeve forming a compressible pumping chamber within said bellows,
• said sleeve and said connected closed end of said bellows closing off a compression chamber at the closed end of said cylinder and forming a sliding piston for collapsing said bellows and pumping liquid out of said pumping chamber
• means for passing air sequentially first to one and then to the other of said bellows compression chambers or successively pumping liquid first from one and then the other of said bellows pumping members and
• said center body member having a plurality of bores therethrough aligned with the inner ends of said sleeves and
• a plurality of push rods extending through said bores between said inner ends of said sleeves whereby the movement of the sleeve connected to one bellows being collapsed moves said push rods and moves the other bellows away from said center body member,
• said means for passing cooling air including for each bellows at least one vent tube projecting form the center body an aligned with the inner end of said sleeve whereby movement of the sleeve toward said center body member at least partially blocks the flow of air through the vent tube to increase the pressure in said vent tube.

An air operated fluid pump comprising, in combination:

• a center body member having fluid inlet and outlet passageways and air inlet and outlet passageways, at least a pair of opposed bellows pumping assemblies each mounted on an opposite face side of said center body member for producing bellows pumping reciprocation back and forth together, each pumping assembly including
• a cylinder open at one end which is connected to said center body member and closed at the other end,
• a sleeve sealably slidable in said cylinder, and
• a bellows positioned within said cylinder and having an open end which is sealably connected to said center body member and a closed end which is connected to said sleeve forming a compressible pumping chamber within said bellows,
• said sleeve and said connected closed end of said bellows closing off a compression chamber at the closed end of said cylinder and forming a sliding piston for collapsing said bellows and pumping fluid out of said pumping chamber,
• a fluid inlet ball valve means on each of said center body opposite face sides connecting said fluid inlet passageway to said pumping chambers, and an outlet slide valve means for connecting said outlet passageway with whichever of said pumping assemblies is collapsing the bellows thereof.

An air operated liquid pump comprising, in combination:

• a center body member,
• at least a pair of opposed bellows pumping assemblies each mounted on an opposite face side of said center body member for producing bellows pumping reciprocation back and forth together, each pumping assembly including
• a cylinder open at one end which is connected to said center body member and closed at the other end,
• a sleeve sealably slidable in said cylinder, and
• a bellows positioned within said cylinder and having an open end which is sealably connected to said center body member and a closed end which is connected to said sleeve forming a compressible pumping chamber within said bellows,
• said center body member having a plurality of bores therethrough aligned with the inner ends of said sleeves and a plurality of push rods extending through said bores between said inner ends of said sleeves whereby the movement of the sleeve connected to one bellows being collapsed moves said push rods and moves the other bellows away from said center body member.