Structure features: 1: cartridge with double seal face and stationary multi-spring type mechanical seal. It can be droved by two ways: clamped drive and adjustable drive ring drive. 2: when installment, the cooling water should intake via higher place and outlet via lower place, the pressure should be lower than 0.2MPa, normal industrial soft water is ok. 3: after well installed the seal, it should take away the limited block firstly before open the device. 4: when operate the mechanical seal, it should open cooling water firstly before open the device. 5: customer also can provide the related size, and then designed and manufactured by our company.