1. 2"cock valve 2. It is fixed with worm-wheel type hand wheel unlocking assembly is operated freely in normal or low tempe ... has union, thread and so on. The specification is 1",2",3",the rate working pressure is 42MPa, 70MPa, 105MPa(6000 ... -wheel type hand wheel unlocking assembly is operated freely in normal or low temperature.2. Without removing from the pipeline, it is necessary ...