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A reciprocating pump includes a housing, a piston slideably mounted within the housing for a reciprocating movement, a shaft connected to the piston and adapted for reciprocating movement concurrently with the piston, an inlet valve, a discharge valve, and an interstage valve means. A first chamber

A reciprocating pump includes a housing, a piston slideably mounted within the housing for a reciprocating movement, a shaft connected to the piston and adapted for reciprocating movement concurrently with the piston, an inlet valve, a discharge valve, and an interstage valve means. A first chamber on one side of the piston is in fluid communication with an inlet and a second chamber on the opposite side of the piston is in fluid communication with a discharge, and the first and second chambers are in fluid communication. At least part of the shaft is in the second chamber. The interstage valve means, which controls the fluid flowing from the first chamber to the second chamber, is closed during a suction stroke and is open during a compression stroke.

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A reciprocating pump includes a housing, a piston slideably mounted within the housing for a reciprocating movement, a shaft connected to the piston and adapted for reciprocating movement concurrently with the piston, an inlet valve, a discharge valve, and an interstage valve means. A first chamber

A reciprocating pump includes a housing, a piston slideably mounted within the housing for a reciprocating movement, a shaft connected to the piston and adapted for reciprocating movement concurrently with the piston, an inlet valve, a discharge valve, and an interstage valve means. A first chamber on one side of the piston is in fluid communication with an inlet and a second chamber on the opposite side of the piston is in fluid communication with a discharge, and the first and second chambers are in fluid communication. At least part of the shaft is in the second chamber. The interstage valve means, which controls the fluid flowing from the first chamber to the second chamber, is closed during a suction stroke and is open during a compression stroke. 1. A high pressure pump, wherein a plunger is reciprocally located in a pressurizing chamber that is formed in a cylinder, wherein the plunger is reciprocated by a driving member and changes the volume of the pressurizing chamber thereby pressurizing fuel in the pressurizing chamber, the pump comprising: a seal member that is located outside of the cylinder, wherein the seal member includes a tube, a flange connected to the tube, a rubber piece that covers the inner surface of the tube and the surface of the flange that is continued to the inner surface of the tube, and a pair of spaced lips connected to the rubber piece, wherein the tube and the flange are made of metal, wherein the lips contact the surface of the plunger, wherein the seal member seals the cylinder from the driving member thereby preventing fuel that leaks from the pressurizing chamber from being mixed with lubricant that lubricates the driving member; and a bracket that clamps the flange of the seal member between the bracket and the cylinder. 2. The high pressure pump according to claim 1, wherein the seal member is accommodated within a space formed between the cylinder and the driving member. 3. The high pressure pump according to claim 1, further comprising a supply passage to supply fluid to the pressurizing chamber and a discharge passage to discharge fluid from the pressurizing chamber. 4. The high pressure pump according to claim 3, wherein a spill valve is located in the pressurizing chamber, and wherein the spill valve selectively opens and closes the supply passage. 5. The high pressure pump according to claim 3, wherein a check valve is located in the discharge passage, and wherein the check valve selectively opens and closes the discharge passage. 6. The high pressure pump according to claim 1, wherein the driving member is reciprocally supported by the bracket and is coupled to the plunger. 7. The high pressure pump according to claim 1, further comprising a cam for reciprocating the driving member and a spring for pressing the driving member against the cam. 8. A high pressure pump, wherein a plunger is reciprocally located in a pressurizing chamber that is formed in a cylinder, wherein the plunger is reciprocated by a driving member and changes the volume of the pressurizing chamber thereby pressurizing fluid in the pressurizing chamber, the pump comprising: a seal member that is located outside of the cylinder, wherein the seal member seals the cylinder from the driving member thereby preventing fluid that leaks from the pressurizing chamber from being mixed with lubricant that lubricates the driving member; a support that is formed separately from the cylinder, wherein the seal member is attached to the support; and a bracket that fixes the cylinder to the support, wherein the support is fixed to the cylinder with the plunger extending through the support, and wherein the support is fixed to the cylinder with the support held between the bracket and the cylinder. 9. The high pressure pump according to claim 8, wherein the seal member includes a metal tube and a rubber piece that covers the inner surface of the tube, and wherein the seal member is attached to the support by press fitting the tube into the support. 10. The high pressure pump according to claim 9, wherein the support is annular and has a flange, and wherein the support is fixed to the cylinder with the flange held between the bracket and the cylinder. 11. The high pressure pump according to claim 10, wherein the seal member includes a pair of spaced lips, and wherein the lips contact the surface of the plunger. 12. The high pressure pump according to claim 8, further comprising a supply passage to supply fluid to the pressurizing chamber and a discharge passage to discharge fluid from the pressurizing chamber. 13. The high pressure pump according to claim 12, wherein a spill valve is located in the pressurizing chamber, and wherein the spill valve selectively open