| 摘要 |
A combination shut-off and test-injection valve has a valve body with an inlet end and an outlet end adapted for connection to a fluid line or conduit and a fluid flow passageway extending from end to end. A shut-off valve in the body is movable between an open position allowing fluid flow through the body and a closed position closing off fluid flow through the body. The combination valve has a test-injection valve in fluid communication with the fluid flow passageway adjacent the shut-off valve which is movable between a normally closed position preventing communication between the fluid flow passageway and the exterior of the body and an open position allowing fluid communication between the fluid flow passageway and the exterior of the body. The shut-off valve and the test-injection valve operate independently whereby the shut-off valve may be operated to open or close fluid flow through the valve body and isolate portions of the fluid system in which it is installed and the test-injection valve may be connected to test equipment, injection devices, and the like for diagnosing and cleaning the fluid system and its components during normal operating conditions or in an isolated condition. The combination valve may be left in the system after installation and will not interfere with normal operations as long as the shut-off valve remains open and will allow subsequent diagnosing and testing of the system and its components.
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