Inverted bucket steam trap - ES5 | Miyawaki

Miyawaki ES5 – Inverted Bucket Steam Trap

The Miyawaki ES5 is a mechanical inverted bucket steam trap designed for small to medium condensate loads in steam networks. Its operation relies on the density difference between steam and condensate: when the bucket loses buoyancy, the valve opens to discharge condensate; when steam enters, the bucket rises, closing the seat. Discharge can be intermittent or nearly continuous, depending on the load.

Technical Specifications

• Sizes: 1/2", 3/4", 1".
• Connection: Rc or NPT; flanged version available on request.
• Body: ductile cast iron FCD450.
• PMA: 1.6 MPa.
• TMA / TMO: 350 °C.
• Minimum differential pressure: 0.01 MPa.
• PMO Versions: ES5-3 at 0.3 MPa, ES5-7 at 0.7 MPa, ES5-11 at 1.1 MPa, ES5-16 at 1.6 MPa.

Construction Features

The ES5 utilizes the SCCV System, stainless steel internal components, and a small vent hole at the top of the bucket for the removal of hot air and non-condensable gases. Backpressure tolerance is up to 90% of upstream pressure, beneficial for condensate recovery systems.

Applications

Suitable for HVAC coils, small heat exchangers, cleaning devices, dyeing machines, and process equipment with low to medium condensate production. Does not require electric or pneumatic actuators.

Installation and Maintenance

Install in horizontal flow, with the nameplate facing upwards and the steam trap lower than the condensate-producing equipment. Allow maintenance space of over 120 mm and provide upstream/downstream isolation valves. Line blow-off is required before startup to remove debris and deposits.

FAQ

When to select ES5-16? When operating pressure reaches up to 1.6 MPa and the flow is covered by the performance chart.
Does it support condensate recovery? Yes, with appropriate check valve and isolation valve at the outlet.