The PG-SSV distributor is a piston valve that supplies a fixed quantity of grease each time. By blocking an outlet, it can be supplied to the following outlet, so that the next outlet grease quantity can be doubled and the different demands can be achieved. A major feature of the PG-SSV distributor is each outlet is progressive, and the latter outlet must wait until the former outlet releases grease. Based on that, the working condition of the distributor can be checked by adding visualized monitors or electronic monitors. Each distributor has 6-24 (all e ven numbers) outlets and is able t o deliver grease up to NLGI 2# or grease with a viscosity greater than 40cSt. The PG-SSV distributor is made of non-fr agile and non-metallic sealing materials. Its exquisite sliding valve and high pressure-resistant end sealing structure (metal contact seal) make it able to withstand high temperature, high cold, and other harsh working conditions.