<h2>Overview</h2>
<p>The <strong>Parker A9SE pressure regulator</strong> is a ductile iron-bodied, pilot-operated outlet pressure control valve engineered by Parker’s Refrigerating Specialties Division (Flo-Con line). This unit delivers precise pressure control for refrigeration and air conditioning systems, featuring an externally equalized design that responds to the pressure at the external equalizer connection—making it ideal for hot gas bypass applications where downstream pressure feedback is critical.</p>
<p>This used unit is suitable for retrofit or replacement applications in commercial refrigeration systems requiring modulation of refrigerant gas flow to maintain nearly constant outlet pressure at the sensing point.</p>
<h2>Key Features</h2>
<ul>
<li><strong>Externally Equalized Design:</strong> Senses pressure at the external equalizer connection, ideal for hot gas bypass and discharge-to-evaporator inlet applications</li>
<li><strong>Pilot-Operated Valve:</strong> <cite index=”1-12,1-13″>Features a ductile iron body with brazed copper couplings and internal passages for precise regulation</cite></li>
<li><strong>Sweat Connection Design:</strong> <cite index=”3-1″>Can be soldered into the refrigerant line without disassembly, yet allows disassembly for cleaning and maintenance without removing the regulator from service</cite></li>
<li><strong>Integral Electric Shut-Off:</strong> <cite index=”1-4″>Features a molded water-resistant Class “H” solenoid coil meeting NEMA 3R and 4 requirements</cite></li>
<li><strong>CSA and UL Listed:</strong> <cite index=”1-12″>CSA certified (File LR20991-14)</cite> for A9S and A9SE variants</li>
</ul>
<h2>Technical Specifications</h2>
<ul>
<li><strong>Port Size (Inlet):</strong> 5/8″</li>
<li><strong>Connection Size:</strong> 7/8″ ODS (brazed copper)</li>
<li><strong>Pressure Range:</strong> 10–120 PSIG</li>
<li><strong>Design Pressure (MRP):</strong> <cite index=”1-12″>500 PSIG (34.5 bar)</cite></li>
<li><strong>Body Material:</strong> Ductile iron with brazed copper couplings</li>
<li><strong>Equalization Type:</strong> Externally equalized (E variant)</li>
<li><strong>Electrical (Solenoid Coil):</strong> <cite index=”1-6″>Power consumption 11 watts or less</cite></li>
<li><strong>Voltage Rating Range:</strong> <cite index=”1-7″>Designed to operate 85% to 110% of rated coil voltage</cite></li>
<li><strong>Certifications:</strong> CSA, UL Listed</li>
<li><strong>Unit Condition:</strong> Used</li>
</ul>
<h2>Typical Applications</h2>
<p>The Parker A9SE is typically applied in:</p>
<ul>
<li><strong>Hot Gas Bypass Systems:</strong> <cite index=”1-16″>Usually applied as a hot gas bypass regulator</cite></li>
<li><strong>Discharge-to-Evaporator Inlet:</strong> <cite index=”2-12″>For applications where discharge gas is introduced into the inlet of the evaporator with a small pilot line connected from compressor suction to the external fitting</cite></li>
<li><strong>Capacity Modulation:</strong> <cite index=”5-6″>To eliminate compressor short cycling and provide proper humidity and oil return control</cite></li>
<li>Commercial refrigeration systems (supermarkets, cold storage, HVACR equipment)</li>
<li>Low-ambient operation requiring head pressure control</li>
</ul>
<h2>Compatibility & Replacements</h2>
<h3>Compatible With</h3>
<ul>
<li><cite index=”3-16″>Systems requiring A9S or A9SE with pilot electric shut-off for pump-down control</cite></li>
<li>Commercial refrigeration systems using R-404A, R-22, R-134a, and other ozone-safe refrigerants</li>
<li>Piping systems with 5/8″ outlet connections (ODS brazed tubing)</li>
<li>Standard solenoid coil voltages (specify voltage and frequency at order)</li>
</ul>
<h3>Replaces / Drop-In Replacement For</h3>
<ul>
<li><cite index=”3-18″>A9E or A9SE cannot be converted to A9 or A9S without replacing the #22 adapter</cite>—verify configuration before ordering as a direct replacement</li>
<li>Other externally equalized A9SE models of equivalent port and connection size</li>
<li>Verify original part number and solenoid coil voltage specifications with your system integrator before ordering</li>
</ul>
<h3>Works With</h3>
<ul>
<li>Parker Refrigerating Specialties (Flo-Con) components and retrofit kits</li>
<li>Standard HVACR system controls and compressor protection devices</li>
<li><cite index=”5-31″>Parker repair kits for A9, A9S, A91E and A9SE regulators</cite></li>
<li>On-site cleaning and maintenance (sweat connection allows in-line servicing)</li>
</ul>
