Inverted bucket steam trap - ES12N | Miyawaki

Miyawaki ES12N – Inverted Bucket Steam Trap

The Miyawaki ES12N is a mechanical inverted bucket steam trap made from cast iron FC250, designed for medium condensate loads in steam networks and process equipment. Drainage is achieved through a mechanical bucket/lever mechanism, without the need for electrical or pneumatic actuators.

Technical Specifications

• Connection: Flanged FF or RF.
• Sizes: DN15–DN50 / 1/2"–2".
• Nominal Pressure: PN16 / 1.6 MPa.
• PMA / PMO: 1.6 MPa.
• TMA / TMO: 220 °C.
• Body Material: Cast iron FC250.
• Available Flanges: ASME/JPI 150 lb, ASME/JPI 300 lb, DIN PN16, JIS 10K / 16K / 20K.

Operation and Selection

The inverted bucket closes the seat when steam is present in the body and opens when the condensate level changes buoyancy. Discharge can be intermittent or nearly continuous, depending on the condensate load and differential pressure. The vent hole at the top of the bucket removes hot air and non-condensable gases, reducing the risk of air locking.

Applications

Suitable for industrial installations, steam lines, heat exchangers, food/beverage equipment, dyeing, and cleaning processes. In condensate recovery lines, it can operate with backpressure up to 90% of upstream pressure, provided a check valve and isolation valve are installed at the outlet.

Installation and Maintenance

The ES12N is installed with horizontal flow, nameplate on the top side, and direction according to the body arrow. It should be installed lower than the equipment generating condensate, with a maintenance clearance of over 240 mm. Line blow-off is required before startup to remove debris.

FAQ

When to choose ES12N?
When a flanged inverted bucket steam trap DN15–DN50 is needed for medium condensate loads.

What to check in reduced flow?
Operating pressure, available Δp, blocked vent hole, debris in the seat, and adequacy of the selected size's capacity.