Pressure regulator type: 131 is pilot controlled gas pressure regulator for low and medium pressure,
which ensure a constant downstream pressure (p ). They can be provided with shut-off device for 2
low and high pressure or for high pressure. They can be used with natural gas, LPG, air, nitrogen, etc.
In the absence of pressure, gas pressure regulator type 131 and type 131-BV are in closed position. Inlet pressure is leaded to the pilot. Pilot is setted at a requested value of pressure p2. Control pressure intake from pilot acting on upper side of diaphragm, thus overcoming the spring (2) action, and through diaphragm assembly and lever move the rod with pad unit and open regulator. At the same time, gas intake thruogh impuls pipe at lower side of diaphragm and a small amount is realised into the outlet pipe. When outlet pressure increase up to presset value, the nozzle (6) is completely opened. Gas consuption cause outlet pressure decreasing, and cause closing nozzle by moving pad unit. This is main gas regulator function: Maintaing constant outlet pressure which is defined by accuracy class (AC). Set point pressure is established by the adjusting screw and spring in pilot. In order to increase the outlet pressure, rotate clockwise the adjusting screw , and to decrease the outlet pressure rotate counterclockwise the adjusting screw.
Gas pressure regulators type 131 and type: 131-BV are equiped with a pilot type: 117. Pilot type: 117 is used for low and medium pressure control. In the absence of pressure, pilot is in open position, i.e. force of the spring, through stirrup act on the rod and maintain the nozzle opened. Letting the gas (inlet gas in regulator p) in installation, gas flow through the pilot and through impuls pipe act on upper side of regulator 1 diaphragm. Outlet pressure from regulator p2, through impuls pipe, act on diaphragm, which together with spring maintain the control pressure p constant. Control pressure is through impuls pipe bringed up at the upper side of regulator diaphragm. At the setted value of control pressure, pilot is still opened, and gas flow from upper dipahragm hosuing of regulator to lower dipahragm housing of regulator. Further increase od pressure p2 close the pilot and pressure in uper and lower dipahragm housing is equalised. Regulator spring close the regulator. Set point of control pressure p is established by the adjusting screw and the spring. In order to increase control pressure, rotate clockwise the adjusting screw, and to decrease the control pressure rotate counterclockwise the adjusting screw.