Abstract: A sliding bearing (1) includes an upper casing (3) which is made of polyacetal resin as a synthetic resin, has an annular surface (2), and serves as a first bearing body; a second bearing body (5) which is made of a synthetic resin, is superposed on the upper casing (3) so as to be rotatable about an axis (0), and has an synthetic resin-made annular surface (4) opposed to the annular surface (2); and a synthetic resin-made annular sheet (6) which is interposed between the annular surfaces (2) and (4) and slidably abuts against at least one of the upper casing (3) and the bearing body (5).

Abstract: A thrust sliding bearing (1) includes an upper casing (3) having an annular surface (2); an annular lower casing (5) which is superposed on the upper casing (3) so as to be rotatable about an axis (0) of the upper casing (3) and has an annular surface (4) opposed to the annular surface (2) of the upper casing (3); and an annular thrust sliding bearing piece (6) and an elastic ring (7) which are superposed on top of each other and are interposed between the annular surfaces (2) and (4).

Abstract: A thrust sliding bearing includes an upper casing having a polyacetal resin-made flat annular surface and a lower casing superposed on the upper casing so as to be rotatable about an axis of the upper casing and having a polyacetal resin-made annular surface opposing the annular surface of the upper casing.

Abstract: A thrust sliding bearing includes an upper casing having a polyacetal resin-made flat annular surface and a lower casing superposed on the upper casing so as to be rotatable about an axis of the upper casing and having a polyacetal resin-made annular surface opposing the annular surface of the upper casing.

Abstract: A sliding bearing (1) includes an upper casing (3) which is made of polyacetal resin as a synthetic resin, has an annular surface (2), and serves as a first bearing body; a second bearing body (5) which is made of a synthetic resin, is superposed on the upper casing (3) so as to be rotatable about an axis (O), and has an synthetic resin-made annular surface (4) opposed to the annular surface (2); and a synthetic resin-made annular sheet (6) which is interposed between the annular surfaces (2) and (4) and slidably abuts against at least one of the upper casing (3) and the bearing body (5).

Abstract: A thrust sliding bearing (1) includes an upper casing (3) which is made of polyacetal resin and has an annular lower surface (2); a lower casing (5) which is made of a reinforced synthetic resin including, in addition to polyacetal resin, reinforcing fibers such as glass fibers contained in this polyacetal resin, is superposed on the upper casing (3) so as to be rotatable about an axis O of the upper casing (3) in an R direction, and has an annular upper surface (4) opposed to the annular lower surface (2) of the upper casing (3); an annular thrust sliding bearing piece (6) which is made of polyacetal resin and is interposed between the annular lower surface (2) and the annular upper surface (4); and a tubular radial sliding bearing piece (7) made of polyacetal resin.

Abstract: A safety valve comprises a pressure receiving hole (20), an actuation chamber (21), a discharging hole (22) and an alloy accommodating chamber (25). An alloy (27) of a low-temperature melting point is accommodated within the alloy accommodating chamber (25). A sealing plate (33) seals the pressure receiving hole (20). This sealing plate (33) has a portion, which faces the pressure receiving hole (20), provided with a breakable sealing portion (35) that breaks up with a predetermined pressure. An actuator (28) is arranged within the actuation chamber (21). The actuator (28) has one end formed with a first back-up portion (30) which supports the breakable sealing portion (35) and has the other end formed with a second back-up portion (31) which is supported by the alloy (27).

Abstract: A thrust sliding bearing (1) includes an upper casing (3) having an annular surface (2); an annular lower casing (5) which is superposed on the upper casing (3) so as to be rotatable about an axis (O) of the upper casing (3) and has an annular surface (4) opposed to the annular surface (2) of the upper casing (3); and an annular thrust sliding bearing piece (6) and an elastic ring (7) which are superposed on top of each other and are interposed between the annular surfaces (2) and (4).

Abstract: A safety valve comprises a pressure receiving hole (20), an actuation chamber (21), a discharging hole (22) and an alloy accommodating chamber (25). An alloy (27) of a low-temperature melting point is accommodated within the alloy accommodating chamber (25). A sealing plate (33) seals the pressure receiving hole (20). This sealing plate (33) has a portion, which faces the pressure receiving hole (20), provided with a breakable sealing portion (35) that breaks up with a predetermined pressure. An actuator (28) is arranged within the actuation chamber (21). The actuator (28) has one end formed with a first back-up portion (30) which supports the breakable sealing portion (35) and has the other end formed with a second back-up portion (31) which is supported by the alloy (27).

Abstract: A synthetic resin-made sliding bearing (1) includes a synthetic resin-made lower casing (2), a synthetic resin-made upper casing (3) superposed on the lower casing (2), a synthetic resin-made disk-shaped thrust sliding bearing piece (4) disposed between the upper and the lower casings (3) and (2), and a synthetic resin-made cylindrical radial sliding bearing piece (5) disposed between the upper and the lower casings (3) and (2).

Abstract: A thrust sliding bearing (1) includes an upper casing (10) having a polyacetal resin-made flat annular surface (2) and a lower casing (20) superposed on the upper casing (10) so as to be rotatable about an axis (O) of the upper casing (10) and having a polyacetal resin-made annular surface (3) opposing the annular surface (2) of the upper casing (10).

Abstract: A synthetic resin-made sliding bearing (1) includes a synthetic resin-made lower casing (2), a synthetic resin-made upper casing (3) superposed on the lower casing (2), a synthetic resin-made disk-shaped thrust sliding bearing piece (4) disposed between the upper and the lower casings (3) and (2), and a synthetic resin-made cylindrical radial sliding bearing piece (5) disposed between the upper and the lower casings (3) and (2).

Abstract: A housing (4) is provided with a shut off valve attaching bore (16) within which an intermediate transmission means accommodating space (25) and a shut off valve chamber (9) are formed. A thrust screw member (17), an intermediate transmission means (18) and a closure member (19) are attached into this bore in the mentioned order. A diaphragm (21) is arranged between the closure member (19) and the intermediate transmission means (18). The diaphragm (21) partitions the shut off valve attaching bore (16) into the intermediate transmission means accommodating space (25) and the shut off valve chamber (9), and hermetically seals the shut off valve chamber (9). Disposed in the intermediate transmission means accommodating space (25) is a valve opening spring (29), which resiliently urges the intermediate transmission means (18) in a valve-opening direction.

Abstract: A housing (4) is provided with a shut off valve attaching bore (16) within which an intermediate transmission means accommodating space (25) and a shut off valve chamber (9) are formed. A thrust screw member (17), an intermediate transmission means (18) and a closure member (19) are attached into this bore in the mentioned order. A diaphragm (21) is arranged between the closure member (19) and the intermediate transmission means (18). The diaphragm (21) partitions the shut off valve attaching bore (16) into the intermediate transmission means accommodating space (25) and the shut off valve chamber (9), and hermetically seals the shut off valve chamber (9). Disposed in the intermediate transmission means accommodating space (25) is a valve opening spring (29), which resiliently urges the intermediate transmission means (18) in a valve-opening direction.

Abstract: A housing (2) has an upper portion engaged with a cylindrical stopper member (20) in screw-thread fitting so as to be able to vertically advance and retract the stopper member (20). The stopper member (20) has an outer thread (20a) engaged with a nut member (21) and has an inner thread (20b) engaged with a thrust screw member (23) each in screw-thread fitting. The stopper member (20) has a stopping portion (A) which prevents the downward movement of the intermediate transmission member (25) connected to the thrust screw member (23) over a predetermined distance. This inhibits a metal diaphragm (12) from being excessively pushed to a valve seat (15). When further moving the diaphragm (12) for valve closing, the nut member (21) is loosened and at the same time the stopper member (20) is advanced downwards to thereby define a gap between a receiving portion (B) of the intermediate transmission member (25) and the stopping portion (A).