Valve with an integral orifice
First Claim
1. A valve with an integral orifice which comprises a valve main body made of heat-resisting materials in which a gas inflow passage and a gas outflow passage in communication with a valve chamber with an open upper end are formed, a valve seat body made of synthetic resin which is fitted in the valve chamber of the valve main body and provided with a gas outflow passage in communication with the gas outflow passage of the aforementioned valve main body and a valve seat, an orifice disc made of heat-resisting materials removably fitted in the gas outflow passage of the valve seat body, and an orifice which is formed in the orifice disc and reduces the outflow passage of the valve seat body, wherein the orifice disc is formed in the shape of a plug and is screwed in the gas outflow passage of the valve sent body, and wherein an inner disc made of heat-resisting materials and provided with a gas inflow passage and a aperture for receiving the valve seat body is inserted into a valve chamber of the valve main body and the valve seat body fitted in the aperture for receiving the valve seat body is fixed airtight to the valve main body by pressing the outer circumferential portions of the inner disc from above.
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Accused Products
Abstract
A valve with an integral orifice for use in gas feeding equipment provided with a pressure-type flow volume control device to be employed for manufacturing of semi-conductors and chemical goods. The valve with an integral orifice has the excellent flow rate control characteristics by improving the processing accuracy of the orifice and preventing the distortion of the orifice at the time of assembling. The orifice is formed in a stainless steel made orifice disc. The metal-made orifice disc with the orifice formed by separate processing and the synthetic-resin-made valve seat body are removably assembled, wherein the orifice disc and the synthetic resin made valve seat body are fixed airtight to the valve main body by pressing the valve seat body via a metal inner disc.
58 Citations
15 Claims
- 1. A valve with an integral orifice which comprises a valve main body made of heat-resisting materials in which a gas inflow passage and a gas outflow passage in communication with a valve chamber with an open upper end are formed, a valve seat body made of synthetic resin which is fitted in the valve chamber of the valve main body and provided with a gas outflow passage in communication with the gas outflow passage of the aforementioned valve main body and a valve seat, an orifice disc made of heat-resisting materials removably fitted in the gas outflow passage of the valve seat body, and an orifice which is formed in the orifice disc and reduces the outflow passage of the valve seat body, wherein the orifice disc is formed in the shape of a plug and is screwed in the gas outflow passage of the valve sent body, and wherein an inner disc made of heat-resisting materials and provided with a gas inflow passage and a aperture for receiving the valve seat body is inserted into a valve chamber of the valve main body and the valve seat body fitted in the aperture for receiving the valve seat body is fixed airtight to the valve main body by pressing the outer circumferential portions of the inner disc from above.
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12. A valve with an integral orifice, comprising:
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a valve main body made of heat-resisting materials, wherein a gas inflow passage and a gas outflow passage are formed therein in communication with a valve chamber with an open upper end;
a valve seat body made of synthetic resin, wherein the valve seat body is fitted in the valve chamber of the valve main body, and the valve seat body is provided with a valve seat, and with a gas outflow passage formed in the valve seat body in communication with the gas outflow passage of the valve main body;
an orifice disc made of heat-resisting materials, wherein the orifice disc is formed in the shape of a plug and is removably fitted to screw in the gas outflow passage of the valve seat body;
the orifice is formed in the orifice disc, wherein the orifice is smaller than the outflow passage of the valve seat body;
an inner disc made of heat-resisting materials, wherein the inner disc is provided with a gas inflow passage and an aperture for receiving the valve seat body, and wherein the valve seat body is inserted into a valve chamber of the valve main body, and the valve seat body fits in the aperture for receiving the valve seat body; and
a diaphragm presser positioned to press a diaphragm to rest on the valve seat, wherein the valve seat body is fixed airtight to the valve main body by the diaphragm presser pressing the valve seat body from above so as to press the outer circumferential portions of the inner disc. - View Dependent Claims (13, 14, 15)
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Specification