低温闸阀
闸阀是最常用的截断阀之一，主要用来接通或截断管路中的介质，不适用于调节介质流量。闸阀适用的压力、温度及口径范围很大，尤其适用于中、大口径的管道。
闸阀的主要优点：
（1）流体阻力小。闸阀闸体内部介质通道是直通的，介质流经闸阀时不改变其流动方向，因而流动阻力较小。
（2）启闭较省力。启闭时闸板运动方向与介质流动方向相垂直。与截止阀相比，闸阀的启闭较为省力。
（3）介质流动方向一般不受限制。介质可从闸阀两侧任意方向流过，均能达到接通或截断的目的。便于安装，适用于介质的流动方向可能改变的管路中。

主要零件材料及性能规范

主要零部件	阀体 阀盖	碳钢	铬镍钛不锈钢		铬镍钼钛不锈钢		超低碳不锈钢	铬钼合金钢	低温碳钢
	闸板 阀座	碳钢堆焊硬质合金或不锈钢	铬镍钛不锈钢 堆焊硬质合金		铬镍钼钛不锈钢 堆焊硬质合金		超低碳不锈钢	铬钼合金钢 堆焊硬质合金	不锈钢堆焊硬质合金
	阀杆	铬不锈钢	铬镍钛不锈钢		铬镍钼钛不锈钢		超低碳不锈钢	铬钼合金钢	不锈钢
	填料	石墨石棉盘根	浸聚四氟乙烯石棉盘根					柔性石墨石棉盘根	浸聚四氟乙烯石棉盘根
	垫片	石棉垫片	不锈钢带四氟乙烯缠绕垫片					柔性石墨+不锈钢	聚四氟乙烯
	阀杆螺母	高镍球铁/ZguAL10Fe3
主要参数	适用介质	水、蒸汽、油品		硝酸类		醋酸类	尿素、甲铵液等	水、蒸汽、石油及石油产品	氨气、液氨
	适用温度℃	≤425		≤200		≤200	≤200	≤550	-45～150

型号	公称		主要结构尺寸(mm)				阀体 材料	性能规范
	通径        DN(mm)	压力         PN(MPa)	D	D0	L	H		适用温度(℃)	适用介质
SFD46Z-40C150C	1/2"	150	89	140	108	345	LCB	≥-46	NH3、丙烷
"	3/4"	"	98	150	117	355	"	"	"
"	1"	"	108	150	127	454	"	"	"
"	2"	"	152	200	178	481	"	"	"
"	3"	"	190	230	203	574	"	"	"
"	4"	"	229	280	229	708	"	"	"
"	6"	"	279	330	267	946	"	"	"
"	8"	"	343	380	292	1118	"	"	"
"	10"	"	406	460	330	1312	"	"	"
"	12"	"	483	510	356	1547	"	"	"
"	14"	"	533	560	381	1811	"	"	"
"	16"	"	597	560	406	2002	"	"	"
"	18"	"	635	610	432	2256	"	"	"
"	20"	"	698	760	457	2532	"	"	"
"	24"	"	813	810	508	3000	"	"	"
SFD101Z-40C150C	1/2"	150	89	140	108	405	LC3	≥-101	乙烯等
"	3/4"	"	98	150	117	415	"	"	"
"	1"	"	108	150	127	514	"	"	"
"	2"	"	152	200	178	591	"	"	"
"	3"	"	190	230	203	634	"	"	"
"	4"	"	229	280	229	768	"	"	"
"	6"	"	279	330	267	1006	"	"	"
"	8"	"	343	380	292	1128	"	"	"
"	10"	"	406	460	330	1372	"	"	"
"	12"	"	483	510	356	1607	"	"	"
"	14"	"	533	560	381	1871	"	"	"
"	16"	"	597	560	406	2062	"	"	"
"	18"	"	635	610	432	2316	"	"	"
"	20"	"	698	760	457	2592	"	"	"
"	24"	"	813	810	508	3060	"	"	"
SFD196Z-40C150P	1/2"	150	89	140	108	405	ZGOCr18Ni9	≥-196	液氨、乙烯、液化天然气等
"	3/4"	"	98	150	117	415	"	"	"
"	1"	"	108	150	127	514	"	"	"
"	2"	"	152	200	178	591	"	"	"
"	3"	"	190	230	203	634	"	"	"
"	4"	"	229	280	229	768	"	"	"
"	6"	"	279	330	267	1006	"	"	"
"	8"	"	343	380	292	1128	"	"	"
"	10"	"	406	460	330	1372	"	"	"
"	12"	"	483	510	356	1607	"	"	"
"	14"	"	533	560	381	1871	"	"	"
SFD196Z-40C150P	16"	150	597	560	406	2062	ZGOCr18Ni9	≥-196	液氨、乙烯、液化天然气等
"	18"	"	635	610	432	2316	"	"	"
"	20"	"	698	760	457	2592	"	"	"
"	24"	"	813	810	508	3060	"	"	"
SFD46Z-540C150C	16"	150	597	560	406	2002	LCB	≥-46	NH3、丙烷
"	18"	"	635	610	432	2256	"	"	"
"	20"	"	698	760	457	2532	"	"	"
"	24"	"	813	810	508	300	"	"	"
SFD101Z-540C150C	16"	150	597	560	406	2062	LC3	≥-101	乙烯等
"	18"	"	635	610	432	2316	"	"	"
"	20"	"	698	760	457	2592	"	"	"
"	24"	"	813	810	508	3060	"	"	"
SFD196Z-540C150P	16"	150	597	560	406	2062	ZGOCr18Ni9	≥-196	液氨、乙烯、液化天然气等
"	18"	"	635	610	432	2316	"	"	"
"	20"	"	698	760	457	2592	"	"	"
"	24"	"	813	810	508	3060	"	"	"
SFD46Z-40C300C	1/2"	300					LCB	≥-46	NH3、丙烷
"	3/4"	"					"	"	"
"	1"	"					"	"	"
"	2"	"	165	230	216	501	"	"	"
"	3"	"	210	280	283	603	"	"	"
"	4"	"	254	330	305	727	"	"	"
"	6"	"	318	380	403	969	"	"	"
"	8"	"	381	460	419	1175	"	"	"
"	10"	"	444	510	457	1426	"	"	"
"	12"	"	521	510	502	1611	"	"	"
"	14"	"	584	560	762	2014	"	"	"
"	16"	"	648	610	838	2230	"	"	"
"	18"	"					"	"	"
"	20"	"					"	"	"
"	24"	"					"	"	"
SFD101Z-40C300C	1/2"	300					LC3	≥-101	乙烯等
"	3/4"	"					"	"	"
"	1"	"					"	"	"
"	2"	"	165	230	216	561	"	"	"
"	3"	"	210	280	283	673	"	"	"
"	4"	"	254	330	305	797	"	"	"
"	6"	"	318	380	403	1039	"	"	"
"	8"	"	381	460	419	1245	"	"	"
"	10"	"	444	510	457	1496	"	"	"
SFD101Z-40C300C	12"	300	521	510	502	1671	LC3	≥-101	乙烯等
"	14"	"	584	560	762	2084	"	"	"
"	16"	"	648	610	832	2300	"	"	"
"	18"	"					"	"	"
"	20"	"					"	"	"
"	24"	"					"	"	"
SFD196Z-40C300P	1/2"	300					ZGOCr18Ni9	≥-196	液氨、乙烯、液化天然气等
"	3/4"	"	117	150	152	497	"	"	"
"	1"	"	124	150	165	522	"	"	"
"	2"	"	165	230	216	561	"	"	"
"	3"	"	210	280	283	673	"	"	"
"	4"	"	254	330	305	797	"	"	"
"	6"	"	318	380	403	1039	"	"	"
"	8"	"	381	460	419	1245	"	"	"
"	10"	"	444	510	457	1496	"	"	"
"	12"	"	521	510	502	1671	"	"	"
"	14"	"	584	560	762	2084	"	"	"
"	16"	"	648	610	838	2300	"	"	"
"	18"	"					"	"	"
"	20"	"					"	"	"
"	24"	"					"	"	"
SFD46Z-40C600C	1/2"	600					LF1	≥-46	NH3、丙烷
"	3/4"	"	35	140	92	382	"	"	"
"	1"	"	41	180	111	447	"	"	"
"	11/2"	"	57	180	141	499	"	"	"
"	2"	"	165	250	292	580	"	"	"
"	3"	"	210	300	356	790	"	"	"
"	4"	"	273	350	432	946	"	"	"
"	6"	"	356	510	559	1255	"	"	"
SFD101Z-40C600C	3/4"	600	38	140	92	422	LC3	≥-101	乙烯等
"	1"	"	55	180	127	497	"	"	"
"	11/2"	"	70	180	200	560	"	"	"
"	2"	"	165	250	292	640	"	"	"
"	3"	"	210	300	356	860	"	"	"
"	4"	"	273	350	432	1010	"	"	"
"	6"	"	356	510	559	1320	"	"	"
SFD196Z-40C600P	1/2"	600	20	150	92	400	OCr18Ni9	≥-196	液氨、乙烯、液化天然气等
"	3/4"	"	35	150	92	422	"	"	"
"	1"	"	41	180	133	497	"	"	"
SFD196Z-40C600P	11/2"	600	57	180	152	560	OCr18Ni9	≥-196	液氨、乙烯、液化天然气等
"	2"	"	165	250	292	640	"	"	"
"	3"	"	210	300	356	860	"	"	"
"	4"	"	273	350	432	1010	"	"	"
"	6"	"	356	510	559	1320	"	"	"