Yarway Series 751/761 Repairable Drip and Tracer Steam Trap

Overview

The Yarway Series 751/761 is a repairable, thermostatic drip and tracer steam trap engineered for continuous condensate removal on steam mains, tracer lines, and light process equipment. The Series 751 is supplied as an in-line body only, while the Series 761 adds an integral wye strainer and blowdown valve in a single unibody casting, letting operators filter, drain, and trap condensate from one compact fitting instead of three separate components. Both variants use a filled thermal element (FTE) that modulates in response to the temperature difference between saturated steam and subcooled condensate, opening and closing the valve seat without any moving mechanical linkage to wear out.

Yarway built its reputation on this thermostatic principle because it tolerates the harsh, cyclical duty of drip and tracer service better than mechanical float or bucket traps of the same size. As an authorized supplier of genuine Yarway and Emerson Automation Solutions equipment, Seven Star LLC provides the Series 751/761 to process plants across Oman and the GCC that need dependable, low-maintenance steam trapping on tracer networks, header drips, and small process heat exchangers, backed by local stock support and application guidance for FTE selection.

Measurement and Operating Principle

The Yarway trap does not measure condensate level or flow directly; instead it senses temperature. The filled thermal element contains a fluid charge that expands as it approaches saturation temperature and contracts as the surrounding condensate subcools below steam temperature. Three FTE options are available: the standard -5 element for drip tracing and light process duty (subcooled only a few degrees below steam temperature, so it discharges near-saturation condensate quickly), the -40 element for tracer service that runs 35 to 45 degrees Fahrenheit subcooled to conserve more heat in the line before discharging, and the -HP element for high-pressure applications up to 600 psig.

In the Yarway Series 751/761, as steam reaches the element, the fill fluid expands, drives the valve stem onto its seat, and shuts the trap so live steam cannot escape. As condensate accumulates and cools past the element’s calibrated subcooling band, the fill fluid contracts, the seat opens, and the accumulated condensate discharges rapidly until steam reaches the element again and the cycle repeats. This self-modulating action requires no external power, air supply, or controller, which is what makes thermostatic traps so common on distributed tracer and drip networks where hundreds of trap stations must operate independently.

Engineering Design

The Yarway Series 751/761 unibody is machined from a single forged block rather than an assembled multi-part body, eliminating the gasketed joints that are the most common failure point on older cast trap designs. The internal seat and FTE cartridge are fully repairable in the line: the cap unscrews, the worn element and seat assembly lift out, and a new cartridge drops in without disturbing the pipe connections. This matters in Oman’s coastal and desert plants alike, where re-piping a trap station for a routine rebuild adds unplanned downtime and scaffolding cost that a cartridge-style repair avoids entirely.

Yarway selects body materials for the service: standard carbon steel and stainless steel bodies cover the majority of drip, tracer, and process applications, with pressure-temperature ratings that scale with the ANSI class of the connecting piping. The Series 761’s integral Y-strainer uses a stainless mesh screen with a blowdown valve, so line debris that would otherwise erode a bare trap seat is captured and can be purged without breaking the connection, extending service intervals between cartridge rebuilds.

Key Features

• Thermostatic filled-element design with no moving mechanical float or bucket to wear or stick
• Fully repairable in-line cartridge — seat and element replace without re-piping the trap station
• Series 761 unibody includes an integral wye strainer and blowdown valve in one casting
• Three FTE options (-5, -40, -HP) matched to drip, tracer, or high-pressure process duty
• Rated for service up to 600 psig depending on FTE selection
• Carbon steel and stainless steel body options for corrosive or coastal environments
• Compact unibody construction eliminates gasketed joints prone to steam leakage
• Proven Yarway thermostatic platform with decades of documented field performance

Industrial Applications

The Yarway Series 751/761 is specified wherever a plant runs distributed steam tracer lines or drip legs off a main header: refineries and gas processing trains that trace heavy crude and sulfur lines to keep them flowing, petrochemical units tracing viscous feedstock piping, power plants draining condensate from steam headers and auxiliary equipment, and district heating or utility distribution networks with hundreds of individual trap stations. Because each trap operates independently with no external control signal, it is equally suited to a single instrument enclosure heater trace or a plant-wide tracer network spanning several process units.

In Oman and the broader GCC, where ambient heat, sour service, and coastal humidity all place extra demand on steam infrastructure, Seven Star LLC positions itself as an authorized channel for genuine Yarway steam traps into refineries, LNG trains, and utility plants in Muscat, Sohar, and Salalah, helping operators standardize on a single repairable trap platform instead of mixing trap types across a site and complicating spares inventory.

Frequently Asked Questions

What is the difference between the Series 751 and Series 761?

The Series 751 is an in-line body only, while the Series 761 adds an integral wye strainer with a blowdown valve in the same unibody casting, combining filtration and trapping in one fitting.

How do I select the right FTE for my application?

On the Yarway trap, use the -5 element for drip tracing and light process duty, the -40 element for tracer lines where extra heat retention in the pipe is desired, and the -HP element for high-pressure process service up to 600 psig.

Can the trap be repaired without removing it from the pipeline?

Yes. The seat and FTE cartridge unscrew from the top of the unibody and can be replaced in the line without disturbing the pipe connections, which is the core advantage of this repairable design.

What steam pressures and temperatures is it rated for?

Pressure-temperature ratings scale with the ANSI class of the connecting flanges or threaded ends and the FTE fitted, with the -HP element supporting service to 600 psig.

Does Seven Star LLC supply genuine Yarway steam traps in Oman?

Yes, Seven Star LLC is an authorized supplier of genuine Yarway and Emerson Automation Solutions steam trapping equipment across Oman and the GCC, including the Series 751/761 and its FTE cartridges.

Technical Specifications

Request a Quote

Seven Star LLC is an authorized supplier of genuine Yarway steam traps and desuperheating equipment across Oman and the GCC. Contact our engineering team for a quotation on the Yarway Series 751/761, FTE cartridge selection, or a full steam trap survey for your Muscat, Sohar, or Salalah facility — this is a quote-on-request item with no listed price.

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