Sporlan Thermal Expansion Valves

Sporlan Thermal Expansion Valves are thermostatic expansion valves used to meter refrigerant flow into the evaporator coil of air conditioning, heat pump, and refrigeration systems. Type O valves use a balance ported, brass bar stock body with a design working pressure of 450 psi on Small O bodies and 425 psi on Large O bodies, covering capacities from 15 to 70 tons on R-22 systems. The balance port design keeps pin and port alignment consistent so pressure drop across the valve doesn't interfere with how the valve regulates refrigerant feed. Adjustable superheat and a replaceable power element let a technician fine-tune valve performance or swap a failed element without replacing the entire valve body. Because Sporlan also produces ER, SR, and RC series valves sized for R-410A equipment, a technician working across mixed refrigerant fleets, older R-22 rooftop units alongside newer R-410A split systems, can usually find a matching valve body rather than retrofitting a mismatched part.

Subcategories

• R-22 Type O Expansion Valves: Type O valves serve R-22 air conditioning and refrigeration systems still in service on older equipment. The line spans capacities from 15 tons on the OVE-15-GA, which uses a 7/8 inch by 1-1/8 inch ODF connection and a 120 inch capillary tube, up to 70 tons on the largest Large O bodies. Technicians servicing legacy R-22 rooftop units and packaged systems use this series since matching the original refrigerant metering device keeps system charge and superheat behavior predictable. Small O bodies carry a 450 psi design working pressure rating while Large O bodies carry 425 psi.
• R-410A ER and SR Series Expansion Valves: ER and SR series valves meter refrigerant on R-410A split systems, heat pumps, and light commercial packaged units. The ERVE-1-C covers 1 ton of capacity with a 1/4 inch by 1/2 inch ODF connection, while the ERZE-15-GA scales up to 15 tons with a 5/8 inch by 1-1/8 inch ODF connection. Residential HVAC technicians reach for this series most often since the bulk of current split system and heat pump installs run R-410A rather than R-22. Each valve ships with a fixed capillary length connecting the valve body to the remote sensing bulb.
• Low-Capacity Valves Under 5 Tons: Low-capacity valves cover small package units, reach-in coolers, and mini-split add-ons where full-size residential valve bodies are oversized for the load. The FJ-1/4-C handles 1/4 ton of capacity through a 1/4 inch by 1/2 inch SAE connection, while the ERZE-4-GA and ERZE-5-GA cover 4 and 5 ton loads respectively through 3/8 inch by 1/2 inch ODF connections. Refrigeration technicians working on small commercial coolers and freezers rely on this range since oversized expansion valves hunt and cause unstable superheat on small loads.
• High-Capacity Valves 20 to 35 Tons: High-capacity valves serve rooftop units, commercial refrigeration racks, and larger packaged systems where a single coil circuit carries a heavier refrigerant load. The OZE-25-GA covers 25 tons through a 7/8 inch by 1-3/8 inch ODF connection, and the OZE-35-GA steps up to 35 tons through a 1-1/8 inch by 1-3/8 inch ODF connection, both with 60 inch capillary tubes. Commercial HVAC and refrigeration technicians size these valves to the coil's rated tonnage rather than the compressor's nominal rating, since an undersized valve starves the coil and an oversized valve overfeeds it.

Buying Guide

Matching a thermal expansion valve to a system starts with refrigerant type, since R-22 and R-410A valve bodies aren't interchangeable even when tonnage ratings match. Sporlan Thermal Expansion Valves split cleanly along that line, with Type O valves built for R-22 and ER, SR, and RC series valves built for R-410A. After refrigerant type, tonnage comes next, and that number should track the evaporator coil's rated capacity rather than the compressor's nameplate tonnage, since an undersized valve starves the coil under high load and an oversized valve overfeeds it and causes liquid floodback. Connection size and capillary tube length matter for the physical installation. A valve with a capillary too short to reach the remote sensing bulb's required location on the suction line forces a workaround that throws off superheat readings, so check capillary length against the actual line set layout before ordering. Internal versus external equalization is another factor; systems with a distributor and multiple coil circuits typically need external equalization to read pressure accurately downstream of the pressure drop through the distributor. Finally, replaceable power elements let a technician restore a valve's performance after a failure without swapping the whole body, which can save a service call when the failure is isolated to the element rather than the valve seat or port.

Frequently Asked Questions

What's the difference between Sporlan Type O and ER series expansion valves?

Type O valves meter refrigerant on R-22 systems while ER series valves are built for R-410A equipment. The two aren't interchangeable since the metering characteristics are tuned to each refrigerant's pressure and temperature relationship, so swapping one in for the other on the wrong refrigerant throws off superheat control.

How is a Sporlan thermal expansion valve sized for a system?

Sizing runs off the evaporator coil's rated tonnage rather than the compressor's nameplate rating. Sporlan's Type O line covers 15 to 70 tons on R-22 while the ER and SR lines cover smaller residential tonnages on R-410A, so matching the coil's actual capacity to the valve's rated range keeps superheat stable.

What does the balance port design do on a Type O valve?

The balance port design keeps the valve's pin and port aligned regardless of pressure drop across the valve. That alignment stops pressure drop from influencing how the valve regulates refrigerant feed, which keeps metering consistent across a wider range of operating conditions than a non-balanced port design.

Can the power element be replaced on a Sporlan expansion valve?

Yes, Sporlan Type O valves use a replaceable power element, so a failed element can get swapped without replacing the entire valve body. That design also allows superheat adjustment without removing the valve from the line set.

What pressure rating do Sporlan Type O valves carry?

Small O valve bodies carry a design working pressure of 450 psi and Large O bodies carry 425 psi. Both ratings apply across the Type O line's 15 to 70 ton capacity range on R-22 systems.