| 摘要 |
The valve includes a housing having aligned inlet and outlet ports intercommunicating by means of a central conduit passing through a rotatable ball mounted in the housing. The central conduit permits fluid flow through the valve when the valve is in the open position. When the ball is rotated to a closed position a second conduit, provided on the surface of the rotatable ball, communicates between the outlet port and an exit orifice in the interior of the housing. The second conduit permits bleeding of the downstream hydraulic system. The ball is seated on sealing washers and rotated by means of a key which is journaled through the housing and into engagement with the ball. The key includes a handle cooperating with stops on the housing to indicate open and closed valve positions.
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