客户提供的关于阀门安装的说明，求大虾帮忙翻译解释一下，谢谢

charles006

客户提供的关于阀门安装的说明，求大虾帮忙翻译解释一下，谢谢
3 l+ n3 f% x" \; b/ ~Installation
Don`t use flange sealings. The seat ring of the Butterfly valves has a sealing lip which operates as flange
gasket between valve and flange during mounting.
$ U, C2 _0 T* y% r* X1 g& l1 p• Insert the valve with the disc in the nearly closed position between the flanges. lf the flanges are located too
4 |. R6 h4 w9 G. }+ W# k1 Zclosely in an existing pipe, they must be so spreaded by means of a special device that the valve can be
; v' i+ I! V. \% S3 zeasily installed with clearance .
5 J3 p  U, F+ f; `$ K• Mount the flange boIts and centre and align the valve between the flanges. Hand-screw the flange bolts.
4 G. Y( F* m1 O2 J" @; w7 U& gSpot weld the flanges to the pipe .
) v% g# n7 _! e0 y0 z' f3 \• Before cross-tightening the flange bolts uniformly, it must be ensured by the test actuation that the valve
disc can move freely within the connecting flanges .
Attention! In case of improper insertion of the disc between the flanges, the seat ring may be displaced and
* x% _1 y  A; K. Q4 I! Y' g- Vdestroyed during the first operations. Similarly, the sealing strip of the valve disc can be damaged if it is not
9 K1 b5 A. u) o; }  U5 d* j  aobserved that the disc can move freely between the flanges.

左旋贝壳

安装
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: n; [2 K% @! ?请勿使用法兰密封件。蝶阀阀座密封面上有一圈密封唇可以充当阀与法兰之间的垫片。（刀口法兰？还是组合垫？）

  t2 h+ ~( U2 Q7 ?6 _/ i将阀门关闭后，将装好阀板的阀门插入到法兰之间。如果法兰离现有的管路太近，应通过一种特殊设备将管路撑开，以便腾出安装间隙。
: A2 C8 n/ i' i( x
/ p' E  Y6 p+ D$ |4 ]装上法兰螺栓，对准阀门和法兰的中心。
拧紧法兰螺栓。
现场将法兰焊接到管路中。
) g! I2 Z( _( o. ~* |, b9 R
4 z4 @9 s* R3 a在交叉拧紧法兰螺栓之前，必须测试阀板在运动时与所连接的法兰不会发生干涉。
" ~% ~2 R/ i( K3 w' \
. N+ v8 @" K! W" C/ z: g' h& f5 g注意！一旦安装阀板错误（与法兰干涉），阀座密封圈会在第一次运动时位移并损坏。同样的，如果没有注意阀板是否能在法兰间自由运动，阀板的密封圈会被损坏。

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翻译的不错！( ^_^ )