V231Y pilot operated self-pressure regulating valve pilot operated type self-pressure regulating valve -> http://www.bub-valve.com/showproduct.asp?id=432, by the control valves, actuators and pilot composition, without external energy to rely on the medium own pressure changes automatically adjusts the pressure energy-saving products, can be used to control devices (maximum temperature of 300 ° C) non-corrosive liquid, gas and steam medium pressure. Widely used in petroleum, chemical, metallurgy, light industry and other industrial sectors and urban heating, heating system. The basic design of the technical specifications: GB / T 17213.1 test: ASME B16.104 Product Specifications Model: V231Y size range: DN20 ~ DN300 Pressure rating: 1.6 ~ 6.4MPa shell material: carbon steel, stainless steel Suitable medium: gas, liquid, steam mode of operation: automatic 【Features】 flow characteristics: quick open Applicable Temperature: -196 to 300 ℃ pressure adjustment range (KPa) :0.8-2; 1.5-4; 3-10; 8-40; 30 to 100 mode of action: (B) back pressure control valve (K) control valve before pressure self-regulating valve manufacturers -> http://www.bub-valve.com/product2.asp?cateid=104 standard Bo Shanghai Valve Factory Co., Ltd.