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名称	型号	公称通径 DN	D	H
止回阀	ZZRN-32	32	110	120
	ZZRN-40	40	120	139
	ZZRN-50	50	136	139
	ZZRN-65	65	176	165
	ZZRN-80	80	205	159
	ZZRN-100	100	234	205