Ball valve
First Claim
1. A ball valve comprising:
- a valve casing having an upstream passageway and a downstream passageway for a fluid, accommodating therein an upstream ball seat and a downstream ball seat, and defining a cavity between said upstream ball seat and said downstream ball seat;
a ball provided with a through hole, accommodated in said cavity, and brought into sealing contact with said upstream ball seat and said downstream ball seat at the outer periphery thereof;
a valve stem having one end thereof fixed to said ball;
a valve handle fixed to the other end of said valve stem;
said ball being rotated by a rotating operation of said valve handle for opening and closing said ball valve;
a check valve accommodated in said through hole of said ball and biased toward said upstream passageway of said valve casing;
a path formed on said ball and, when said ball valve is closed, causing said downstream passageway and said cavity to communicate with each other; and
a connection port formed on said valve casing so as to communicate with said cavity, and having a free end thereof connected to one end of a nipple having the other end thereof covered with a cap.
1 Assignment
0 Petitions
Accused Products
Abstract
A ball valve includes a valve casing accommodating therein an upstream ball seat and a downstream ball seat and defining a cavity between the two ball seats, a ball provided with a through hole, accommodated in the cavity and brought into sealing contact with the two ball seats at the outer periphery thereof, a valve stem having one end thereof fixed to the ball, a valve handle fixed to the other end of the valve stem, a check valve accommodated in the through hole of the ball and biased toward the upstream side, a path formed on the ball and, when the ball valve is closed, causing the downstream side and the cavity to communicate with each other, and a connection port formed on the valve casing so as to communicate with the cavity and having a free end thereof connected to one end of a nipple having the other end thereof covered with a cap. The ball opens and closes the ball valve through the valve stem by a rotating operation of the valve handle.
14 Citations
4 Claims
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1. A ball valve comprising:
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a valve casing having an upstream passageway and a downstream passageway for a fluid, accommodating therein an upstream ball seat and a downstream ball seat, and defining a cavity between said upstream ball seat and said downstream ball seat; a ball provided with a through hole, accommodated in said cavity, and brought into sealing contact with said upstream ball seat and said downstream ball seat at the outer periphery thereof; a valve stem having one end thereof fixed to said ball; a valve handle fixed to the other end of said valve stem; said ball being rotated by a rotating operation of said valve handle for opening and closing said ball valve; a check valve accommodated in said through hole of said ball and biased toward said upstream passageway of said valve casing; a path formed on said ball and, when said ball valve is closed, causing said downstream passageway and said cavity to communicate with each other; and a connection port formed on said valve casing so as to communicate with said cavity, and having a free end thereof connected to one end of a nipple having the other end thereof covered with a cap. - View Dependent Claims (2, 3, 4)
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Specification