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鑄造低溫閘閥
Cast Cryogenic Gate Valves

鑄造低溫閘閥概述

    液化氣體如氧、氮、氬、天然氣、氫或氦（-218oC）的生產、運輸和儲存，存在著幾個技術難題。Velan一家采用的加長閥帽鑄造閥門更**更有效。

 The production, transport and storage of liquefied gases such as oxygen, nitrogen, argon, natural gas, hydrogen or helium (down to - 425°F), presents several technical problems. Velan specially-adapted extended bonnet cast valves offer safe and efficient service.

鑄造低溫閘閥材料選用 MATERIALS

1. 閥體和閥帽：閥體和閥帽采用奧氏體不銹鋼鑄件，具有更好的撞擊強度，較小的熱損耗，更加耐腐蝕。
    Body and bonnet: Austenitic stainless steel castings used for bodies and bonnets offer excellent impact strength, minimal heat loss and protection against corrosion.
2. 閥桿：奧氏體不銹鋼。為了抗磨損，閥桿也采用A479等級XM-19材料，抗拉強度更好，即使在超低溫環境，在閥桿接觸點處，仍然具有優異的低摩擦和無磨損運動的性能。
    Stem: Austenitic stainless steel. To reduce galling, stems are also offered in A479 grade XM-19 with high tensile strength even at extreme low temperatures, excellent low friction and galling-free movement at points of stem contact.
3. 接觸液體的部件：奧氏體不銹鋼和鎢鉻鈷合金6。
    Wetted parts: All Austenitic stainless steel and Stellite 6.
4. 閥桿螺母/軛架襯套：奧氏體球墨鑄鐵Gr. D-2C。
    Stem nut/yoke bushing: Austenitic ductile iron Gr. D-2C.
5. 填料：通過絕緣氣體柱防止PTFE或石墨填料凍結凝固。
    Packing: PTFE or graphite packing protected from freezing by a column of insulating gas.
6. 閥座面：采用鎢鉻鈷合金6，避免磨損和擦傷。
   如果需要緊密關閉，截止閥和止回閥都會配置四氟乙烯、PTFE或其它軟鑲嵌件。
   Seating faces: Stellite 6 is used to prevent seizing and galling.
    When extremely tight shutoff is required, globe and check valves are supplied with Neoflon, PTFE or other soft inserts.
7. 螺栓：應力硬化奧氏體不銹鋼。
    Bolting: Strain-hardened Austenitic stainless steel.
8. 閥桿螺母的潤滑：Exxon Nebule No. 930-AA或Shell Darina EPI或相同的產品。
    Lubrication of stem nut: Exxon Nebula Lubriplate No. 930-AA or Shell Darina EPI or equivalent.

鑄造低溫閘閥結構特征 DESIGN FEATURES:

1. 具有足夠的氣體柱長度的加長閥帽，通常由用戶指定，配置在所有閥門上，使得閥桿填料與低溫液體之間保持足夠的距離，從而能夠保持自身的性能。
    Extended bonnets with sufficient gas column length, usually specified by customer, are supplied for all valves to keep stem packing at sufficient distance away from the cold fluid to remain functional.
2. 適用于低溫環境的鎢鉻鈷合金閥座面的柔性楔板。
    Flexible wedges with Stellite seating faces for cryogenic service.
3. 備有可用于截止閥，活塞和旋啟式止回閥閥瓣的四氟乙烯鑲嵌件。
    Neoflon inserts are available for globe, piston, and swing check discs.
4. 清潔處理：所有低溫閥門都**進行脫脂和清洗，管路端口都經過密封，以防止污染。
    Cleaning: All cryogenic valves are thoroughly degreased and cleaned and pipe ends are sealed to prevent contamination.

鑄造低溫閘閥執行標準    Administer Standard

設計與制造 Design and Manufacture	結構長度 Face to face/ End to end	法蘭尺寸 Flange Dimension	壓力-溫度 Pressure Temperature Lating	試驗-檢驗 Inspection and Test
API  602	ANSI B16.10	ANSI B16.5	ANSI B16.34	API 598

鑄造低溫閘閥壓力試驗  Pressure Test

公稱壓力PN(Lb)NominalPressure	強度試驗Shell Test		水密封試驗 Water Seal Test		氣密封試驗 Air Seal Test
	MPa	Lbf/in2	MPa	Lbf/in2	MPa	Lbf/in2
150	3.0	430	2.2	315	0.4-0.7	60-100
300	7.7	1110	5.7	815
600	15.3	2220	11.3	1630

鑄造低溫閘閥主要零件材料及性能 Main Part Materials and Property

體 蓋 板（瓣） Body Cover Disc	閥桿 Stem	密封面 Sealing Face	墊片 Sealing Shim	填料 Packing	工作溫度℃ Working Temperature	適用介質Suitable Medium
LCB	431	STL/STL	1Cr13/柔性石墨 低溫石棉 1Cr13/Flexible  Graphite SUB-Zero asbestos	柔性石墨 Flexible Graphite PTFE 浸聚四氟乙烯石棉繩 Asbestos String With PTFE Soaked	-46	丙烷/丙烯 甲醇/乙烷 煤氣/液氨 Propane Propylene Methanol Coal-gas Liquid Ammonia
LC1					-60
LC2					-73
LC3	CrF321				-101
LC4					-115
CF8					-196

液化氣體表 TABLE OF LIQUEFIED GASES

類型 Type	沸點 Boiling Point		液體密度 Liquid Density lb/ft.3	類型 Type	沸點 Boiling Point		液體密度 Liquid Density lb/ft.3
	oC	oF			oC	oF
天然氣 Natural gas (LNG)	-168	-270	26	空氣 Air	-194.4	-318	57.87
甲烷(CH4) Methane (CH4)	-161.5	-258	26.20	氮 (N2) Nitrogen (N2)	-195.8	-320	50.45
氧 (O2) Oxygen (O2)	-182.9	-296	71.20	氫 (H2) Hydrogen (H2)	-252.7	-423	4.43
氬 (Ar) Argon (Ar)	-185.9	-303	878.40	氦 (He) Helium (He)	-268.9	-452	7.82
二氧化碳 Carbon Dioxide (CO2)	-78.5	-109	50.60	優良零度 Absolute zero	-273.16	-460	-

鑄造低溫閘閥主要尺寸和重量   Size Main Dimensions and Weight

DN		150Lb     主要尺寸  Dimensions (mm)								重量(kg)Weight
mm	in	L	D	D1	D2	b	n-φd	H	D0
25	1	127	108	79.2	51	14.2	4-16	350	120	9
32	11/4	140	117	89	63	16	4-16	385	120	11
40	11/2	165	127	98.5	73	17.5	4-16	420	150	15
50	2	178	152	120.5	92	19	4-19	540	150	23
65	11/2	190	178	139.7	105	22.4	4-19	610	180	27
80	3	203	190	152.5	127	24	4-19	690	200	40
100	4	229	229	190.5	157	24	8-19	780	200	50
125	5	254	254	215.9	186	24	8-22.5	930	250	70
150	6	267	279	241.3	216	25.4	8-22.5	980	250	85
200	8	292	343	298.5	270	28.4	8-22.5	1180	280	135
250	10	330	406	362	324	30.2	12-25.4	1390	300	180
300	12	356	483	431.8	381	32	12-25.4	1620	350	265
350	14	381	533	476.3	413	35	12-29	1810	350	420
400	16	406	597	539.8	470	36.6	16-29	1970	400	550
300Lb     凸面法蘭   RF
50	2	216	165	127	92	22.4	8-19	575	200	30
65	21/2	241	190	149.4	105	25.4	8-22.5	635	240	38
80	3	283	210	168.1	127	28.4	8-22.5	715	300	51
100	4	305	254	200.2	157	31.8	8-22.5	815	350	79
125	5	381	279	235	186	35	8-22.5	965	400	115
150	6	403	318	269.7	216	36.6	12-22.5	1025	400	140
200	8	419	381	330.2	270	41.2	12-25.4	1225	400	220
250	10	457	444	387.4	324	47.8	16-28.5	1440	450	290
300	12	502	521	450.8	381	50.8	16-32	1665	500	410
350	14	762	584	514.4	413	54	20-32	1880	600	600
400	16	838	648	571.5	470	57.2	20-35	2050	650	750
600Lb     凸面法蘭   RF
50	2	292	165	127	92	33	8-19	630	280	45
65	21/2	330	190	149.4	105	36	8-22.5	700	300	58
80	3	356	210	168.1	127	39	8-22.5	760	300	75
100	4	432	273	216	157	45	8-25.4	900	400	126
125	5	511	330	266.7	186	52	8-28.5	990	450	186
150	6	559	356	292.1	216	55	12-28.5	1070	500	260
200	8	660	419	349.3	270	63	12-32	1280	600	385
250	10	787	508	431.8	324	71	16-35	1500	650	500
300	12	838	559	489	381	74	20-35	1740	700	700