SCV check valves are exclusively installed at the outlet side of steam turbines. These fast closing non-return valves shall protect the turbine from back flow of steam or water which may severely damage the turbine blades.
The free swinging SCV design closes by gravity. The disc is designed to provide two times more gravitational closing force than required to overcome the frictional losses in the bearings.
Optionally, a pneumatic actuator for power assisted closing can be added. This configuration features a two piece shaft design connected by a free travel clutch (lost motion coupling). The free travel clutch is only engaged in the event of actuator closing. This design also eliminates frictional losses caused by the packings and does not negatively effect the pressure loss.
Even after installation the actuator can be mounted to the other valve side.
The standard SCV design features butt weld ends. If a flanged design is preferred welding flanges can be added.
The disc plate is made of Chromium steel to reduce abrasive effects. The top entry mounting port allows disc replacement without removing the valve from line.
The solid stainless steel seat ring is welded on the body and meets Class V tightness.