碳钢截止阀作用
J41H-16C/25/40/64/100/160截止阀的启闭件是塞形的阀瓣，密封面呈平面或锥面，阀瓣沿流体的中心线作直线运动。阀杆的运动形式，有升降杆式（阀杆升降，手轮不升降），也有升降旋转杆式（手轮与阀杆一起旋转升降，螺母设在阀体上）。截止阀只适用于全开和全关，不允许作调节和节流。截止阀属于强制密封式阀门，所以在阀门关闭时，必须向阀瓣施加压力，以强制密封面不泄漏。
碳钢截止阀原理
当介质由阀瓣下方进入阀门时，操作力所需要克服的阻力，是阀杆和填料的摩擦力与由介质的压力所产生的推力，关阀门的力比开阀门的力大，所以阀杆的直径要大，否则会发生阀杆顶弯的故障。近年来，从自密封的阀门出现后，截止阀的介质流向就改由阀瓣上方进入阀腔，这时在介质压力作用下，关阀门的力小，而开阀门的力大，阀杆的直径可以相应地减少。同时，在介质作用下，这种形式的阀门也较严密。我国阀门“三化给”曾规定，截止阀的流向，一律采用自上而下。
J41H/Y碳钢截止阀主要尺寸
2.5MPaDNLDD1D2Bn-φdHD0
凸面法兰
RF
J41H
J4lY
J41W
J4lF
J41N
25
25P
25R
25I10130906040164-φ14198120
15130956545164-φ14218120
201501057555164-φ14258140
251601158565164-φ14275140
3218013510078184-φ18280160
4020014511085184-φ18330180
50230160125100204-φ18350200
65290180145120228-φ18400280
80310195160135228-φ18355280
100350230190160248-φ23415320
125400270220188288-φ25460360
150480300250218308-φ25510450
2006003603lO2783412-φ25710500
2506504253703323612-φ30786550
3007504854303904016-φ30925600
3508505504904484416-φ341075700
4009506105505054816-φ341235800
45012006606005555020-φ34-1000
500125073066061O5220-φ41-1000
主要尺寸
4．OMPaDNLDDlD2D6bn-φdHDO
凹凸法兰
MFM
J41H
J41Y
J41W
J41F
J41N
40
40P
40R
40I1013090604135144-φ14198120
1513095654540164-φ14233120
20150105755551164-φ14275140
25160115856558164-φ14285160
321801351007866184-φ18302160
402001451108576184-φ18355200
5023016012510088204-φ18373200
65290180145120110228-φ18408280
80310195160135121228-φ18436280
100350230190160150248-φ23480320
125400270220188176288-φ25588360
150480300250218204308-φ25611400
2006003753202822603812-φ30720400
6.4MPa15170105755540184-φ14195400
凹凸法兰
MFM
J41H
J41Y
J41W
J41F
J41N
64
64P
64R
64I20190125906851204-φ18228160
252101351007858224-φ18275180
322301501108266244-φ23325200
402601651259576244-φ23360240
5030017513510588264-φ234lO280
65340200160130110288-φ23450320
80380210170140121308-φ23485360
100430250200168150328-φ25537400
125500295240202176368-φ30631400
150550340280240204388-φ34646450
2006504053453002604412-φ34813500
10.0MPa10170100705035204-φ14198140
凹凸法兰
MFM
J41H
J41Y
J41W
100
100P
100R
100I15170105755540204-φ14202140
20190125906851224-φ18228160
252101351007858244-φ18250180
322301501108266244-φ23326200
402601651259576264-φ23360240
5030019514511288284-φ25414280
65340220170138110328-φ25434320
80380230180148121348-φ25547360
1004302652lO172150388-φ30621400
125500310250210176428-φ34732400
150550350, 2902502044612-φ34840450
2006504303603122605412-φ41925500
16.0MPa15170110755240244-φ18148140
凹凸法兰
MFM
J41H
J41Y
J41W
160
160P
160R
160I20190130906251264-φ23158160
252101401007258284-φ23175180
322301651158566304-φ25200200
402601751259276324-φ27231240
5030021516513288368-φ25262280
65340245190152110448-φ30303320
80380260205168121468-φ30341360
100430300240200150488-φ34485400