초록 ▼

An injection valve includes a housing having an inlet, an outlet, and a fluid channel extending between the inlet and the outlet. A piston is slidable within a bore of the housing between a first position wherein the piston is relatively far from the closed end and a second position wherein the pist

An injection valve includes a housing having an inlet, an outlet, and a fluid channel extending between the inlet and the outlet. A piston is slidable within a bore of the housing between a first position wherein the piston is relatively far from the closed end and a second position wherein the piston is relatively near to the closed end. A biasing spring biases the piston toward the first position. The piston closes and seals the inlet when the piston is in the first position and allows fluid to pass from the inlet to the fluid channel to the outlet when the piston is in the second position. A piston seal is formed between the piston and a wall of the bore, dividing the bore into a unsealed chamber and a sealed chamber adjacent to the closed end. There is no vent between the sealed chamber and an exterior of the housing. Pressure differences between the unsealed chamber and the sealed chamber that adversely affect performance may be minimized by providing a deformable membrane or a gas accumulator communicating with the sealed chamber, or providing an initial pressure differential wherein a gas pressure within the sealed chamber is less than a gas pressure within the unsealed chamber, when the piston is in its first position.

대표청구항 ▼

1. An injection valve comprising:a housing having an inlet, an outlet, and a fluid channel extending between the inlet and the outlet; a bore within the housing; a piston slidable within the bore between a first position and a second position and biased toward the first position, the piston closing

1. An injection valve comprising:a housing having an inlet, an outlet, and a fluid channel extending between the inlet and the outlet; a bore within the housing; a piston slidable within the bore between a first position and a second position and biased toward the first position, the piston closing and sealing the inlet when the piston is in the first position and allowing fluid to pass from the inlet to the fluid channel to the outlet when the piston is in the second position; and a piston seal between the piston and a wall of the bore, the piston seal dividing the bore into a sealed chamber and an unsealed chamber, there being no vent between the sealed chamber and an exterior of the housing.