High-Performance Air-Cooled Hydraulic Oil Cooler — High Flow, Low Pressure Drop

The Thermal Transfer Products Industrial AOVH Series is a high-performance air-cooled hydraulic oil cooler built with a copper-tube, aluminum-fin core. As the high-capacity version of TTP’s AO Series, it delivers high heat rejection and low pressure drop for high-flow applications, using a double-core, AC-fan-driven design in a compact footprint. Its High-Low Turbulator design is what yields high flow capacity with low flow pressure, making it well suited to demanding, continuous-duty cooling.

The AOVH cools hydraulic oil (and fluids such as glycols) with ambient air, and is widely used on hydraulic power units, injection molding machines, gear drives and gearboxes, machine tools, torque converters, and marine equipment. A high-performance fan and adjustable cabinet louvers let you regulate the direction of heated exhaust air, and the versatile design supports one- or two-pass flow. Two-pass units (the AOVHR configuration) route oil through the core twice for greater heat rejection and add an integral relief bypass valve that protects against high backpressure during cold starts, high-viscosity operation, or pressure spikes.

Maximum operating pressure is 300 PSI with a maximum operating temperature of 400°F. Fan motors are built for fan duty and rated for ambient temperatures up to 104°F, with single- and three-phase options and explosion-proof motors available for hazardous locations. To simplify system integration, the AOVH Series is fully supported with 3D CAD models, downloadable datasheets, and technical documentation, and TTP’s XSelector^® sizing program helps optimize model selection.

Consult catalog for additional sizes and technical information.

Mobile Air-Cooled Hydraulic Oil Coolers — Hydraulic Motor Drive

The Thermal Transfer Products AOHM and AOVHM Series are mobile air-cooled hydraulic oil coolers built with a copper-tube, aluminum-fin core and driven by a long-life hydraulic motor — ideal for off-highway and mobile equipment where electric fan power isn’t practical. The AOHM is the hydraulic-motor version of TTP’s AO Series, and the AOVHM is the hydraulic-motor version of the higher-performance AOVH Series, together covering a wide flow range and high heat removal up to 210,000 BTU/hr.

Their heavy-duty construction is designed for remote mounting away from the engine’s heat, which provides more efficient cooling than mounting near the radiator and avoids blocking main engine airflow. Both models can be configured for one- or two-pass flow — supporting either low-flow/high-heat-rejection or high-flow/high-rejection applications — and can be set up with an internal pressure bypass for cold-start protection. High/low turbulators optimize heat rejection at lower flow rates, and a high-performance fan with adjustable louvers lets you direct heated exhaust air where you want it.

Maximum operating pressure is 300 PSI on the oil side with a maximum operating temperature of 400°F, and NPT connections are standard. (Note the hydraulic motor itself carries a separate 2,000 PSI maximum with 1,000 PSI allowable back pressure — keep case-drain pressure drop to 5 PSI or less to protect pump shaft seals.) TTP’s XSelector^® sizing program — available online and as a mobile app — helps size the right model for your flow, heat load, and space.