UL 144-2021 pdf free download.LP-Gas Regulators.
6.8 SERVICE-RESERVE INDICATOR — A device that gives a visual indication when the regulator system has switched from the designated service” cylinder to the designated “reserve” cylinder.
6.9 VALVE:
a) TYPE I RELIEF VALVE — A valve that is constructed to relieve pressure resulting from seat leakage due to the inability of the seat mechanism to achieve lock-up.
b) TYPE II RELIEF VALVE — A valve that has a start-to-discharge setting in accordance with Table
18.1 and is constructed to limit regulator outlet pressure to 13.8 kPa (2 psig) [for second-stage. integral two-stage and automatic changeover regulators when used as part of a Iwo-stage regulator system) or 34.5 kPa (5 psig) [for 13.8 kPa (2 psig) service and integral 13.8 kPa (2 psig) 13.8 kPa (2 psig)service regulators when used as part of a 13.8 kPa (2 psig) regulator system] when tested in accordance with the Type II Relief Valve Flow Capacity Test, Section .i.
7 Service Pressure and Temperature Ratings
7.1 The maximum inlet pressure rating of a single-stage regulator, first-stage regulator, high-pressure
regulator, integral two-stage regulator, or integral 13.8 kPa (2 psig) service regulator shall not be less than
1723.7 kPa (250 psig).
7.2 The maximum inlet pressure rating for a second-stage regulator or 13.8 kPa (2 psig) service regulator shall be 68.9 kPa (10 psig).
7.3 Regulators shall meet all of the requirements of this standard when exposed to ambient temperatures within the range of -40°C — +55CC (40°F — +130°F).
CONSTRUCTION
8 Assembly
8.1 A regulator. designed for field adjustment, shall be provided with convenient means of adjustment.
8.2 A screw, bolt, or lever-pin hole shall not extend through the outer wall of the regulator body into a gas-handling chamber unless closed by a threaded plug or the equivalent means to prevent leakage of gas.
8.3 A valve seat or disc shall be attached to its holder by a method that does not permit the disc to loosen and work out of position when tested in accordance with the requirements in Section , Leakage and Strength of Mechanism Test, and Section 33, Endurance Test.
8.4 A holder and disc assembly shall be constructed to preclude the trapping of air or gas behind the disc that may expand and force the disc out of its position in the holder.
8.5 A regulator having an external adjusting screw shall be constructed so that turning the screw clockwise will increase the regulator outlet pressure. See the Exception to.UL 144 pdf download.