Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
Page 7
Page 8
Page 9
Page 10
Page 11
Page 12
Page 13
Page 14
Page 15
Page 16
Page 17
Page 18
Page 19
Page 20
Page 21
Page 22
Page 23
Page 24
Page 25
Page 26
Page 27
Page 28
Page 29
Page 30
Page 31
Page 32
Page 33
Page 34
Page 35
Page 36
Page 37
Page 38
Page 39
Page 40
Page 41
Page 42
Page 43
Page 44
Page 45
Page 46
Page 47
Page 48
Page 49
Page 50
Page 51
Page 52
Page 53
Page 54
Page 55
Page 56
Page 57
Page 58
Page 59
Page 60
Page 61
Page 62
Page 63
Page 64
Page 65
Page 66
Page 67
Page 68
2015 Maxitrol Company. All Rights Reserved. DRAFT 09.18.2013 63 Dead End Lockup Pressure will be maintained within ANSICSA limits under no flow conditions. The amount of climb above set point is influenced by inlet pressure flow rate before no flow condition and piping arrangement. Dead end lockup pressure regulators must be properly sized for desired performance. Differential Pressure The difference between inlet pressure to the pressure regulator and outlet pressure from the pressure regulator. To obtain differential pressure subtract the desired outlet pressure from available inlet pressure. Line Pressure Regulator A pressure regulator intended for installation in a building gas distribution system between the building service regulator or LP-gas 2 psi service regulator and gas utilization equipment. Lockup Type Under no flow conditions outlet pressure will rise above adjusted pressure but will not rise to line pressure. Minimum Capacity Main Burner Only Minimum capacity of a pressure regulator designed to control the flow to the main burner only. Maximum Capacity Main Burner Only Maximum capacity of a pressure regulator at which the pressure regulator will control main burner pressure within acceptable limits. Maximum Capacity Main Burner and Pilot Maximum capacity of a pressure regulator at which the pressure regulator will control main burner and pilot line pressure within acceptable limits. Capacity Total load Btuh of all appliances combined. Maximum Individual Load Largest single appliance or burner served by the pressure regulator. Maximum Individual Load Capacity 1. The maximum capacity or flow at which a line pressure regulator will control lockup pressure within acceptable limits. 2. The maximum capacity or flow at which a pressure regulator will control pilot line pressure within acceptable limits. Non-Lockup Type Under static conditions when no gas is flowing outlet pressure will rise to line pressure. Overpressure Protection Device OPD Adevicewhichunderabnormalconditionswillacttoreduce restrict or shut off the supply of gas flowing into a system to prevent pressure in that system from exceeding 2 psi. Monitoring Regulator An overpressure protection device which functions as a second pressure regulator in series with the primary pressure regulator. Overpressure Relief Device An overpressure protection device which functions by discharging gas from the downstream system to a safe location. Overpressure Shut-Off DeviceAn overpressure protection device which functions by completely shutting off the flow of gas into the downstream system. Pressure Drop The natural loss of pressure that occurs in the pressure regulator or in any valve or pipe due to friction. This friction impedes fluid motion without regard to artificial losses deliberately created by diaphragm action. The equivalent flow rate for a loss in given pressure with the pressure regulator valve in a normally wide open position. Rated Inlet Pressure The highest inlet pressure for which the control is intended to be used. Vent Limiter A means that limits the flow of gas from the atmospheric chamber to the atmosphere in the event of a diaphragm rupture. This may be either a limiting orifice or a ball check vent limiting device. Limiting Orifice Type A vent limiter where the flow through the limiter is the same in both directions Zero Governors They require an external impulse signal such as top loading with pressure or generating vacuum in the downstream piping. DEFINITIONS