A pressure reducing valve for gas is provided in which a valve mechanism having opening in a central part a valve hole that communicates with a low pressure passage and a low pressure chamber and including a valve body that is capable of being seated on a valve seat facing a valve chamber communicat
A pressure reducing valve for gas is provided in which a valve mechanism having opening in a central part a valve hole that communicates with a low pressure passage and a low pressure chamber and including a valve body that is capable of being seated on a valve seat facing a valve chamber communicating with a high pressure passage is housed within a body such that the valve body is connected to a pressure receiving member operating in response to pressure of the low pressure passage and the low pressure chamber, wherein the body (16) is formed by joining a plurality of body members (18, 19) having different strengths, the entirety of the high pressure passage (30, 64) being formed, among the plurality of body members (18, 19), within the body member (18) that has a high strength, and at least part of the low pressure passage (85, 86, 94, 119) and the low pressure chamber (83, 84, 116) being formed, among the plurality of body members (18, 19), within the body member (19) that has a low strength. This enables the cost to be reduced.
대표청구항▼
1. A pressure reducing valve for gas in which a valve mechanism (20) having opening in a central part thereof a valve hole (68) that communicates with a low pressure passage (85, 86, 94, 119) and a low pressure chamber (83, 84, 116) and comprising a valve body (59) that is capable of being seated on
1. A pressure reducing valve for gas in which a valve mechanism (20) having opening in a central part thereof a valve hole (68) that communicates with a low pressure passage (85, 86, 94, 119) and a low pressure chamber (83, 84, 116) and comprising a valve body (59) that is capable of being seated on a valve seat (58) facing a valve chamber (66) communicating with a high pressure passage (27, 28, 30, 64) is housed within a body (16, 16′) such that the valve body (59) is connected to a pressure receiving member (115) operating in response to pressure of the low pressure passage (85, 86, 94, 119) and the low pressure chamber (83, 84, 116), characterized in that the body (16, 16′) is formed by joining two, that is, first and second body members (18, 19; 18′, 19′) having different strengths, the body (16, 16′) being formed by joining the second body member (19, 19′), which has a low strength, and the first body member (18, 18′), which has a high strength and has an insertion hole (25) coaxially housing the valve mechanism (20), so that the second body member (19, 19′) and the first body member (18, 18′) overlap each other in a direction along an axis of the valve body (59) while forming therebetween a pressure reduction chamber (83), which is the low pressure chamber, and a circular cross-section fitting projection (18a) projectingly provided integrally with the first body member (18, 18′) so as to be coaxial with the insertion hole (25) is hermetically fitted into the second body member (19, 19′). 2. The pressure reducing valve for gas according to claim 1, wherein a groove (110, 133, 134) is provided in at least one of joining faces of the plurality of body members (18, 19; 18′, 19′) that are joined to each other to form the body (16, 16′), the groove (110, 133, 134) forming between the body members (18, 19; 18′, 19′) that are joined to each other a housing chamber (132) housing heating means (131) or a heating medium passage (109) through which a heating medium flows. 3. A pressure reducing valve for gas in which a valve mechanism (20) having opening in a central part thereof a valve hole (68) that communicates with a low pressure passage (85, 86, 94, 119) and a low pressure chamber (83, 84, 116) and comprising a valve body (59) that is capable of being seated on a valve seat (58) facing a valve chamber (66) communicating with a high pressure passage (27, 28, 30, 64) is housed within a body (16, 16′) such that the valve body (59) is connected to a diaphragm (115) operating in response to pressure of the low pressure passage (85, 86, 94, 119) and the low pressure chamber (83, 84, 116), [1] characterized in that the body (16, 16′) is formed by joining two, that is, first and second body members (18, 19; 18′, 19′), a groove (110, 133, 134) is provided in at least one of joining faces of the body members (18, 19; 18′, 19′), the groove (110, 133, 134) forming between the body members (18, 19; 18′, 19′) in a state of being joined together a housing chamber (132) for housing heating means (131) or a heating medium passage (109) through which a heating medium flows, the first body member (18, 18′) has an insertion hole (25) coaxially housing the valve mechanism (20), a circular cross-section fitting projection (18a) projectingly provided integrally with the first body member (18, 18′) so as to be coaxial with the insertion hole (25) is hermetically fitted into a fitting hole (80) of the second body member (19, 19′), the second body member (19, 19′) clamps a peripheral edge part of the diaphragm (115) between the second body member (19, 19′) and a diaphragm cover (17) so that the diaphragm (115) is positioned coaxially with the fitting hole (80), and the valve body (59) is connected to a central part of the diaphragm (115). 4. The pressure reducing valve for gas according to claim 3, wherein the heating medium passage (109) or the housing chamber (132) is formed in an arc shape surrounding the valve body (59) and the valve seat (58) when viewed in a direction along an axis of the valve body (59). 5. The pressure reducing valve for gas according to claim 3 or 4, wherein the heating medium passage (109) or the housing chamber (132) is disposed at substantially the same position as the valve seat (58) in a direction along an axis of the valve body (59). 6. The pressure reducing valve for gas according to claim 3, wherein the body member (19; 18′, 19′) having the groove (110, 133, 134) formed therein is molded, and the groove (110, 133, 134) is formed at the same time as said molding. 7. The pressure reducing valve for gas according claim 3, wherein a heating medium that is guided to the heating medium passage (109) is engine cooling water. 8. The pressure reducing valve for gas according to claim 3, wherein the heating means (131) is an electric heater.
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