Adjusting mechanism for steam extraction pressure for steam extraction turbine

The invention discloses an adjusting mechanism for steam extraction pressure for a steam extraction turbine, relating to an adjusting mechanism for steam extraction pressure for a steam turbine. The invention aims at solving the problem for the existing adjusting mechanism for steam extraction pressure that when the industrial steam extraction pressure is over 1.8 MPa, the existing adjusting mechanism can not achieve effective adjustments for the steam extraction pressure and the steam extraction amount because of the limit of the structure of rotary clapboard. The invention is as follows: a valve seat is installed on an air cylinder; the lower end of a valve disc is contacted with the inner surface of the valve seat; the lower end of the valve rod penetrates the central hole of the valve disc and a guide hole of the valve seat; the valve rod is fixedly connected with the valve disc by bolts; the upper part of the valve rod passes through a through hole on a valve cover; a valve rod sleeve is arranged between