Back pressure control valve
AssigneeAdvance Denki Kougyou Kabushiki Kaisha
InventorsHironori Mastuzawa, Kimihito Sasao
Life of this patent
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Abstract
A back pressure control valve which accurately controls pressure of fluid on a primary side but is not affected by pressure variations on a secondary side. The back pressure control valve 10 has a first chamber 12, a second chamber 14, a flow path 16 with a valve seat 17, a valve mechanism 20 with a rod portion 21 with a valve portion 22, a first diaphragm 30 within the first chamber which is provided with a first pressure adjusting mechanism M1, and a second diaphragm 40 within the second chamber which is provided with a second pressure adjusting mechanism M2.
Claims3
A back pressure control valve (10) for controlling fluid on a primary side to be in a predetermined pressure condition, comprising:
- a body (11) including
- a first chamber (12) having an inlet portion (13) for controlled fluid,
- a second chamber (14) having an outlet portion (15) for the controlled fluid, and
- a communicating flow path (16) for fluid communication between the first and second chambers and being formed with a valve seat, and
- a valve mechanism (20) including
- a rod portion (21) with a valve portion (22) for operating and closing the valve seat and being positioned on the first chamber side of the communicating flow path,
- a first diaphragm portion (30) provided on one side of the rod portion and being arranged within the first chamber, and
- a second diaphragm portion (40) provided on the other side of the rod portion and being arranged within the second chamber;
- wherein an outer peripheral portion (32) of the first diaphragm portion is fixed to the body comprising the first chamber, the first chamber being divided into a first valve chamber (51) including the inlet portion inside the first diaphragm portion and a first pressure adjusting chamber (52) outside the first diaphragm portion,
- wherein an outer peripheral portion (42) of the second diaphragm portion is fixed to the body comprising the second chamber, the second chamber being divided into a second valve chamber (56) including the outlet portion inside the second diaphragm portion and a second pressure adjusting chamber (57) outside the second diaphragm portion, and
- wherein the first pressure adjusting chamber is provided with a first pressure adjusting means (M1) for adjusting the pressure of the first diaphragm portion to be a predetermined set pressure in a predetermined direction, while the second pressure adjusting chamber has a second pressure adjusting means (M2) for adjusting the pressure of the second diaphragm portion to be a predetermined set pressure in a predetermined direction.
Dependencies are inferred from the claim text.