Patent ID: 9689315
Date: 2017-06-27
CPC Classifications: F01D,F02C,F04D,F16K,Y10T

Claim:
1. A bleed valve for a turbomachine comprising: an inlet housing; an outlet housing downstream of the inlet housing; a hollow shaft defining a valve axis having a first end mounted to an inner diameter portion of the inlet housing and a second end mounted to an end cap of the outlet housing, wherein a radial gap is defined around the entire periphery of the end cap between an outer diameter surface of the end cap and a portion of the outlet housing; a full-area piston slidably mounted to the shaft between the inlet housing and the end cap for movement between an open and a closed position; a first pressure chamber defined between an upstream side of the piston and the inner diameter portion of the inlet housing in fluid communication with an intermediate-pressure port; and a second pressure chamber defined between a downstream side of the piston and the end cap in fluid communication with a solenoid pressure port, wherein the solenoid pressure port is configured to connect to a solenoid pressure valve that controls the pressure in the second pressure chamber, wherein an area of an upstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the first pressure chamber is substantially equal to an area of a downstream surface of the piston at an angle with respect to the valve axis and in fluid communication with the second pressure chamber.