High flow low pressure control valve
Mass flow controllers and control valves are disclosed. A control valve includes a poppet including a plurality of vertical flow channels, and the control valve also includes an orifice element that includes a plurality of vertical flow channels extending from a bottom surface of the orifice element, through the orifice element, to a top surface of the orifice element. The vertical flow channels of the orifice element are axially misaligned with the vertical flow channels of the poppet to prevent gas from flowing through the orifice element when the gap between the top surface of the poppet and the bottom surface of the orifice element is closed.
1. A control valve comprising:
a valve cavity including an inlet port and an outlet port;
a poppet disposed within the valve cavity, the poppet comprising:
a plurality of vertical flow channels, wherein a bottom surface of the poppet faces the inlet port;
an orifice element disposed within the valve cavity between the poppet and the outlet port; and
a push rod;
wherein, the orifice element comprises:
a push rod slot for allowing the push rod to extend through the orifice element and contact the poppet to allow the push rod to move the poppet relative to the orifice element to open and close a gap between a top surface of the poppet and a bottom surface of the orifice element; and
a plurality of vertical flow channels extending from a bottom surface of the orifice element, through the orifice element, to a top exterior surface of the orifice element;
wherein the vertical flow channels of the orifice element are axially misaligned with the vertical flow channels of the poppet to prevent gas from flowing through the orifice element when the gap between the top surface of the poppet and the bottom surface of the orifice element is closed.
2. The control valve of claim 1 , wherein the orifice element includes a plurality of horizontal flow channels.
3. The control valve of claim 2 , wherein each of the horizontal flow channels intersects at least one of the vertical flow channels of the orifice element.
4. The control valve of claim 1 , wherein each of the poppet and the orifice element include multiple channel-rings, wherein each channel-ring in each of the poppet and orifice element is made up of the vertical channels that are equidistant from a center of the corresponding poppet and orifice element.
5. The control valve of claim 1 , wherein the orifice element includes support ridges defining surface flow passages on a top surface of the orifice element.
6. The control valve of claim 1 , wherein the poppet includes a recessed portion to receive the push rod.
7. The control valve of claim 2 , wherein each of the horizontal flow channels intersects other horizontal flow channels in a push rod cavity wherein the push rod cavity has a larger diameter section than the push rod slot.
8. The control valve of claim 1 , wherein the orifice element includes a greater number of horizontal flow channels in a first 180-degree sector of the orifice element facing the outlet port than a second 180-degree sector of the orifice element facing away from the outlet port.
9. A control valve comprising:
a valve cavity including an inlet port and an outlet port;
a poppet disposed within the valve cavity, the poppet comprising plurality of vertical flow channels, wherein a bottom surface of the poppet faces the inlet port;
an orifice element disposed within the valve cavity between the poppet and the outlet port, the orifice element comprising:
means for directing a gas vertically and horizontally through the orifice element;
means for directing the gas along a top exterior surface of the orifice element; and
means for directing movement of the poppet relative to the orifice element to open and close a gap between a top surface of the poppet and a bottom surface of the orifice element to control a flow of the gas through the control valve.