Structure features: 1: cartridge with single seal face and multi-spring type mechanical seal. It is mainly used for desulfurization system agitator, and it is stationary and balanced type mechanical seal. 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 and can flow freely 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.