Product Manual 128 PQC Series Control Valve 1" 1500 lbs

Description continued,Any process leakage passing through thepacking is permitted to escape through a leakoffvent which passes through the packing box andout the valve body. This prevents any leakagefrom passing along the stem into the actuatorand also prevents loading pressure leakagefrom the lower diaphragm from reaching thevalve body through the stem.Warning:The leakoff vent must be kept open at alltimes. Flammable or other hazardous fluidsshould be vented into an open, well-ventilatedarea to prevent fire or explosion.Table 1: SpecificationsFactory-set specifications for your individual CVS 128PQC Control Valve are stamped on thenameplate, located on the upper diaphragm casing.End Connection Style CVS Type 128 PQC 1-inch NPT FemalePort DiametersMaximum Inlet Pressures andTemperatures**Maximum Pressure Drops** See Table 2Actuator Operating PressuresMaximum Actuator CasingPressureShutoff ClassificationsMaterial TemperatureCapabilitiesFlow CharacteristicFlow DirectionIn 1/4, 3/8, 1/2Metal SeatCVS Typemm 6.4, 9.5, 12.7128PQCIn 1/4, 3/8, 1/2, 3/4*Soft Seatmm 6.4, 9.5, 12.7, 19.1*-20 o F to +100 o F (-29 o C to 38 o C) 3600 psig (248 bar)+150 o F (+66 o C) 3550 psig (245 bar)+180 o F (+82 o C) 3520 psig (243 bar)20 psig (1.4 bar) or 35 psig (2.4 bar)100 psig (6.9 bar)ANSI Class IV ANSI/FCI 70-2-1998 – 0.01 percent ofMetal Seatmaximum valve capacity using air at a pressure drop of 50 psi(3.4 bar, differential), at 50 o F to 125 o F (10 o C to 52 o C)ANSI Class IV ANSI/FCI 70-2-1998 – Less than one bubbleSoft Seatper minute (0.15 ml) per minute using air at a pressure drop of50 psi (3.4 bar, differential) at 50 o F to 125 o F (10 o C to 52 o C)Metal Seat -20 o F to +180 o F (-29 o C to +82 o C)Soft Seat -20 o F to +150 o F (-29 o C to +55 o C)Quick opening with 45-degree taper valve plugEither directionMaximum Rated Travel3/8 inches (10mm)Actuator Diaphragm EffectiveArea33 inches 2 (213 cm 2 )Actuator Pressure Connection 1/4-inch NPT FemaleValve Travel IndicationValve travel is indicated on plastic indicator cover with scale divisions indicated every 25 percentof travel.Approximate Weight CVS Type 128 PQC 17 lb (7.7 kg)* Cageless construction with seat cut into body** Pressure and temperature restrictions outlined in this guide, along with any applicable code limitation, should not be exceeded2