LIQUIDS AND GAS FLOW REGULATORS PSV Proportionating Electromagnetic Valves are designed to respond to variable power inputs to proportionately regulate the flow of liquids and gases. PSV Proportionating Electromagnetic Valve For added safety PSV valves are normally closed (NC) when de-energized. They can also serve as “ON-OFF” valves. For control functions see the PSV-D Driver Module. Flow is controlled by increasing or decreasing the voltage applied to the coil. This causes a magnetic force which raises the core and allows gas to flow. PSV valves, constructed of stainless steel are available in five different sizes covering flow ranges from 3.5 L/min - 100 L/min air and 125 mL/min - 2.85 L/min H2O. TABLE 73 MAX FLOW RATES AND CV VALUES FOR PSV ORIFICE SIZE MODEL NUMBER *MAXIMUM FLOW [mL/min] AIR Principle of Operation A variable stroke electromagnetic valve featuring a valve seat design which permits increasing or decreasing flow rates of liquids or gases through it in proportion to variable input power. Leak Integrity 1 x 10-9 mL/min Rigid metallic construction Gas and liquids. Max pressure of 1000 psig (68.9 bars) Regulator Systems Complete flow regulating systems include a PSV electromagnetic valve connected to a pulse width *Based on 10 psig (690 mbar) differential pressure. modulated PSV-D Driver Module. For details see Driver **The selection of materials of construction, is the responsibility Module description. of the customer. The company accepts no liability. MAXIMUM POWER REQUIRED: Normally closed (NC) when de-energized. 1/4" Compression fittings optional 1/8" and 3/8". 3.45" (87.6mm) high x 3.25" (82.6mm) long (including compression fittings) x 1.00" (25.4mm) deep. ** MATERIALS IN FLUID CONTACT: BULLETIN EM201305 PSV POWER INPUT: Types 316 and 416 stainless steel, Viton® O-rings. Optional O-rings: Buna®, EPR and Kalrez®. MAXIMUM PRESSURE: MAXIMUM DIFFERENTIAL PRESSURE: LEAK INTEGRITY: 1 X 10-9 smL/sec Helium individually tested. MAXIMUM TEMPERATURE (typical): 174 FF (79 FC) inside, 130 FF (54 FC) outside surface at 24Vdc. www.aalborg.com - e-mail ౧ [email protected] - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837 82

LIQUIDS AND GAS FLOW REGULATORS Pressure Drops Across PSV Valves PSV3 PRESSURE DROP Cross Sectional View PSV Valve FLOW L/min 83 www.aalborg.com - e-mail ౧ [email protected] - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837 PSV Proportionating Electromagnetic Valves

ORDERING INFORMATION LIQUIDS AND GAS FLOW REGULATORS MODEL PSV SERIES 1 2 3 4 5 MATERIAL S Stainless Steel Viton® Buna® EPR PTFE / Kalrez® FITTINGS 1/4" Compression A B 1/8" Compression D 3/8" Compression Special X PSV4 stainless steel, Viton® seals with 1/4" compression fittings. www.aalborg.com - e-mail ౧ [email protected] - ( 845.770.3000 - fax 845.770.3010 - Toll Free in U.S.A. and Canada 1.800.866.3837 84

PULSE WIDTH MODULATED DRIVER MODULES PSV-D Pulse width modulated PSV-D Driver Modules regulate the power supplied to PSV Regulating valves based on a reference signal. Pulse Width Modulated Driver Module Set-point signals, 0-5 Vdc or 4-20 mA, input are employed to control the output pulse width modulated voltage at a fixed frequency (≈30KHz) and amplitude. Incoming power to the valve coil is applied and discontinued for predetermined periods of time by a low loss solid state switching element. As incoming power is applied, energy in the inductive coils increases and when it is discontinued energy...

ORDERING INFORMATION PULSE WIDTH MODULATED DRIVER MODULES PSV-D Output vs. Flow Ranges Valve Voltage Volts V3 29VDC Output Voltage V2 22VDC Output Voltage CONTROL SIGNAL VOLTS Jumper selectable output power allows a choice of dc voltage range for cooler more efficient operation, as a function of flow rates. Internal resettable fuse protects electronics and rectifier circuits, prevents polarity reversal damage. The maximum output voltage supplied to the PSV Valve can be set or changed in the field to allow for optimal use of the input reference signal to output voltage based on the specific flow...