蝶阀球阀力矩

式中：Q d -------动水作用力(N)

g--------重力加速度9810mm/s 2 λa ------蝶板开度为α角时的动水力系数，查表得 H------计算升压在内的最大静水压头 ξa-----蝶板开度为α角时的流阻系数，查表得 ζ0-----蝶板全开时的流阻系数，查表得 V 0-------全开时介质的流速(mm/s)H 按下式计算：

Q C =Q d =(2*10-8*g*λa *H*D 2)/(ξa-ζ0+2*g*H/V 0

2

)

M M ≈4q M *R*b M *f M *(h 2+R 2)0.5

式中：h-------阀杆与蝶板中心的偏心距(mm)M C 按下式计算M C =1/2*Q C *f C *d F

式中：Q C ------作用在阀杆轴承上的载荷(N) f C -------轴承的摩擦系数

d F --------阀杆直径或轴承内径(mm)

当蝶板处于密封状态时，Q 计算如 Q=3.14/4*D 2P 式中：D------蝶板直径(mm)

当蝶板处于启闭过程中，Q 计算如

(2)对偏置蝶板MM 按下式计 Mj---------静水力矩(N.mm),阀杆垂直安装时Mj=0 Md---------动水力矩(N.mm)

计算蝶阀在关闭或开启过程中的阀杆力矩时，M M =0,M j =0,对于关闭过程中Md 为正值，

开启过程为负值

M m 分两种情况计算如下：(1)对中心对称蝶M M =4q M *b M *f M *R 2

式中：q M --------密封比压(Mpa)，对橡胶密封圈q=(0.+0.6p)/(b m )0.5 b M ------密封面的接触宽度(mm) f M -------密封面的摩擦系数，对橡胶密封圈，f=0.8-1.0 R------蝶板的密封半径(mm) M T ------------密封填料的摩擦力矩(N.mm)二.蝶阀阀杆力矩

M D =M M +M C +M T +M j +M d

式中：M D --------蝶阀阀杆力矩(N.mm) M M-----------密封面间摩擦力矩(N.mm) M C --------阀杆轴承的摩擦力矩(N.mm)

公称通径b m R f M q M M M h M M 偏心10030500.90.10955295773034492.41253062.50.90.1095546214.13051262.215030750.90.1095566548.33071674.71753087.50.90.1095590579.63095755.6200301000.90.1095511830830123517300301500.90.1095526619330271465350301750.90.1095536231930367604400302000.90.1095547323230478527500302500.90.1095573942630744730600303000.90.109551064773301070083700303500.90.109551449274301454588800304000.90.109551892929301898246900304500.90.1095523957383024010561000305000.90.1095529577023029630211200306000.90.1095542590913042644111500307500.90.1095566548293066601512000

30

1000

0.9

0.10955

1.2E+07

30

1.2E+07

公称通径D Q C

f c

d F M C 10010078500.15201177512512512265.60.152018398.4150

150

17662.50.15

25

33117.2

M M ≈4q M *R*b M *f M *(h 2+R 2)0.5二.计算M C

M C =1/2*Q C *f C *d F Q C =3.14/4*D 2P 2.对偏置蝶板

式中：Q------流量(m 3/h) A------管子截面积(m 2) t-------关阀时间（s)M d 按下式计算：

M d =(2*10-9*g*μa *H*D 3)/(ξa-ζ0+2*g*H/V 02)

式中：μa------蝶板开度为α角时的动水力距系数，查表 Md 的最大值通常在α=600-800范围内

一.计算M M

1.对中心对称蝶板M M =4q M *b M *f M *R 2

q M =(0.+0.6p)/(bm)0.5 p=1MPa △

H=9.8*104*(p+△p)

式中：△p------由于水锤作用在阀前产生的压力升值按下式计算：

175********.60.152545076.2200200314000.152558875300300706500.152814836535035096162.50.15302163664004001256000.15302826005005001962500.15355151566006002826000.15408478007007003846500.154512981948008005024000.154516956009009006358500.15452145994100010007850000.155029437501200120011304000.155042390001500150017662500.155066234382000200031400000.1550 1.2E+07

公称通径M

M

M M 偏心M C M D 中心对称M D 偏置N*M N.M 最终数据1002957734492.4117754135246267.446.2674362.46112546214.151262.218398.464612.569660.769.6606894.0419********.371674.733117.299665.5104792104.7919141.46917590579.695755.645076.2135656140832140.8318190.12320011830812351758875177183182392182.3923246.23300266193271465148365414558419830419.8298566.77350362319367604216366578684583969583.9694788.359400473232478527282600755832761127761.12651027.52500739426744730515156125458212598871259.8871700.8560010647731070083847800191257319178831917.8832589.14700144927414545881298194274746827527822752.7823716.26800189292918982461695600358852935938463593.8464851.69900239573824010562145994454173245470504547.056138.521000295770229630212943750590145259067715906.7717974.141200425909142644114239000849809185034118503.41111479.615006654829666015166234381.3E+07 1.3E+0713283.5917932.82000 1.2E+07 1.2E+07 1.2E+072.4E+07 2.4E+07

23611.13

31875

计算后的M D 按一般原则再乘以系数1.25-1.35

蝶板扭矩M D （注：M M ,M M 偏心是按p=1MPa 计算,可根据不同介质压力乘以相应p)例：p=2MPa ,则M M ,M M 偏心乘以2再各与M C 相加即为相应蝶板扭矩