Pressure-balanced fluid pressure regulators

摘要

Pressure-balanced fluid pressure regulators are described. An example fluid regulator includes a fluid flow control member disposed within a fluid flow passageway of a valve body and moves relative to a seat ring to modulate fluid flow through the fluid flow passageway. A valve stem couples the fluid flow control member to an actuator. The valve stem has a pathway to allow fluid from an inlet of the fluid flow passageway to flow across the flow control member between a first side of the flow control member and a second side of the flow control member opposite the first side to pressure-balance the fluid flow control member.

主权项

1. A fluid regulator comprising:
a valve body defining a fluid flow passageway between an inlet and an outlet; an actuator to be coupled to the valve body, the actuator having a first chamber and a second chamber, the valve body or the actuator defining a third chamber to be fluidly separated from the first and second chambers of the actuators; a fluid flow control member to be disposed within the fluid flow passageway, the flow control member to move relative to a seat ring to modulate fluid flow through the fluid flow passageway between the inlet and the outlet, the flow control member having a first side to engage the seat ring and a second side opposite the first side; a valve stem to couple the fluid flow control member to the actuator, the valve stem having a pathway to fluidly couple the inlet of the fluid flow passageway and the third chamber to enable fluid from the inlet to flow across the fluid flow control member between the first side of the fluid flow control member and the third chamber in direct fluid communication with the second side of the flow control member to pressure-balance the fluid flow control member when the flow control member is in engagement with the seat ring; a port in fluid communication with the third chamber, the port to fluidly couple the inlet and a fluid source via the pathway of the valve stem and the third chamber; and a guide positioned in the third chamber and slidably coupled to the flow control member, the guide having a first end and a second end, the first end of the guide having a first flanged portion captured between the valve body and the actuator, the second end having a second flanged portion to engage a flange of the flow control member, the flow control member to slide relative to the guide when the flow control member moves between an open position and a closed position relative to the seat ring.