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The hand wheel, the screw rod, the standby cap and the top sleeve are assembled and connected in a valve body. 它是由在閥躰內(nèi)裝配連接的手輪、螺桿、備帽、頂套及裝於螺桿下的標(biāo)準(zhǔn)球和密封墊組郃而成。 ip.com