US 12,253,100 B2
Eliminating bleed on flow controls
Harold Randall Smart, Portsmouth, RI (US)
Assigned to Dresser, LLC, Houston, TX (US)
Filed by Dresser, LLC, Houston, TX (US)
Filed on Nov. 30, 2021, as Appl. No. 17/538,667.
Prior Publication US 2023/0167834 A1, Jun. 1, 2023
Int. Cl. F15B 13/043 (2006.01); F15B 13/04 (2006.01)
CPC F15B 13/0433 (2013.01) [F15B 13/0405 (2013.01); F15B 2211/30535 (2013.01); F15B 2211/6309 (2013.01); F15B 2211/6336 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A flow control, comprising:
an actuator;
a controller coupled with the actuator to deliver an actuator control signal to the actuator;
an amplifier disposed in the controller and configured to control the actuator control signal, the amplifier comprising:
a main valve; and
a bleed valve coupled with the main valve,
wherein the bleed valve opens before the main valve in response to an increase in an amplifier input signal to the main valve, and
wherein the main valve comprises a plurality of moveable plugs, one of which vents the actuator control signal in response to a decrease in the amplifier input signal.