Patent ID: 6871803

Claim:
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.