Inverted bucket steam trap - ER25 | Miyawaki Miyawaki - 1
Inverted bucket steam trap - ER25 | Miyawaki Miyawaki - 1

Inverted bucket steam trap - ER25 | Miyawaki

Miyawaki ER25 – Inverted Bucket Steam Trap

The Miyawaki ER25 is a mechanical inverted bucket steam trap made from cast steel SCPH2, designed for high condensate loads and higher pressure steam applications. It operates using a dual steam separation mechanism with a U-shaped duct and inverted bucket, allowing condensate discharge through mechanical bucket/lever movement without an external actuator.

Technical Specifications

  • Sizes: 1/2" to 2".
  • Connections: Flanged RF/RJ or socket weld.
  • Flange Standards: ASME/JPI, DIN, JIS.
  • Available Classes: JIS 10K, 20K, 30K, 40K, 63K, ASME/JPI 150 lb to 1500 lb, DIN PN40, PN63, PN100.
  • Body Material: Cast steel SCPH2.
  • Max Operating Temperature: 425 °C.
  • ER25 / ER25W Versions: 2.5 MPa, 4.4 MPa, or 6.4 MPa max operating pressure and corresponding max differential pressure.

Operational Features

A small vent hole at the top of the bucket removes hot air and non-condensable gases, reducing air locking. The SCCV System is a self-centering valve assembly, useful in steam traps with frequent cyclic operation. The ER25 supports condensate recovery with backpressure up to 90% of upstream pressure, provided the return line has proper check and isolation.

Applications

Suitable for heat exchangers, dryers, unit heaters, process drains, dyeing facilities, cleaning installations, food units, and HVAC systems with increased condensate flow. Selection is based on flow rate, Δp, backpressure, steam temperature, DN, connection type, and required pressure class.

Maintenance

The design allows for on-line repair. During service, check the strainer, seat, valve, bucket, lever, gaskets, and vent hole. Pipework cleaning is required before startup, especially after welding or new installation.

FAQ

When to choose ER25 over ES/ESH?
When higher condensate flow or operation up to 6.4 MPa and 425 °C is required.

What should be specified in the order?
DN, connection type, flange standard, operating pressure, backpressure, condensate flow, and steam temperature.

Standard (Options)
  • DIN
  • ANSI
  • JIS
Connection (Options)
  • Flanged
Material (Options)
  • Stainless Steel
Pressure Rating (Options)
  • 10K
  • 20K
  • 30K
  • 40K
  • 63K

Description

SCCV System
Horizontal installation
Auto blow-off
Stainless Steel
Vertical installation
Supports condensate recovery
Bypass function

1980 Received the Award for Excellence in Energy Saving

Features

Complete steam containment

A double steam separation mechanism (implemented with a U-shaped duct and inverted bucket) provides reliable steam separation and ensures trap tightness.

Free from steam and air locking

This model is free from steam and air locking due to a small air vent hole in the top of the bucket (discharges hot air and non-condensable gases).

Easy maintenance

For quick and easy maintenance, this model can be repaired directly in line.

Superb durability

Offers superb durability thanks to the SCCV System valve and robust super lever, as well as stainless steel internal components.

Condensate recovery

With its high degree of back pressure tolerance, this model supports condensate recovery at pressures up to 90% of the upstream pressure.

SuperDischargerSCCV_color_eng

*’SCCV System’ is an abbreviation of Self Closing and Centering Valve System.

Typical applications

Suitable for use in a wide range of fields including the plant industry, foodstuff manufacturing, dyeing, cleaning, and air conditioning.

Dimensions/Weight

Flanged

ER25_FF
SizeFlange standardsDimensions (mm)Dimensions (in)Weight
ＬＨ1H2H3WＬＨ1H2H3W(kg)(lb)

1/2”
3/4”
1”

JIS(RF)

10K,20K,30K,40K

340

210

18034524813.48.37.113.69.8

51,0

112.4

ASME/JPI(RF)

150lb,300lb

ASME/JPI(RF)

600lb

34513.6

ASME/JPI(RJ)

150lb,300lb,600lb

JIS(RF)

63K

38015.058,0127.9

ASME/JPI(RF)

900lb

ASME/JPI(RJ)

900lb,1500lb

51,0112.4
1 1/4”
1 1/2”
2”

JIS(RF)

10K,20K,30K,40K

38015.058,0127.9

ASME/JPI(RF,RJ)

150lb,300lb,600lb

JIS(RF)

63K

40015.8

ASME/JPI(RF,RJ)

900lb

ASME/JPI(RJ)

1500lb

SizeFlange standardsDimensions (mm)Dimensions (in)Weight
LH1H2H3LH1H2H3(kg)(lb)
DN15-25DIN PN4034021018034513.48.37.113.651,0112.2

DIN PN63/

PN100 (DN15/DN20)

34513.6

DIN

PN63/PN100

(DN25)

38015.0
DN32-50

DIN

PN40/PN63/PN100

40015.858,0127.9

*Customized face-to-face dimensions on request.

Socket Weld

ER25_SW
SizeDimensions (mm)Dimensions (in)Weight
ＬＨ1H2H3WＬＨ1H2H3W(kg)(lb)
1/2”
3/4”
1”
1 1/4”
1 1/2”


340

21018034524813.48.37.113.69.848,0105.8
2”38015.049,0108.0

Specifications

ModelConnection

Max. operating

pressure

Max. operating

pressure differential

Max. operating

temperature

Body material
TypeSize(MPa)(psig)(MPa)(psig)(℃)(℉)
ER25-25

Flanged

RF,RJ

 

 

1/2”2,53602,5360425797

Cast steel

SCPH2

3/4”
1”
1 1/4”
1 1/2”
2”
ER25-451/2”

4,4

6404,4640
3/4”
1”
1 1/4”
1 1/2”
2”
ER25-651/2”6,49256,4925
3/4”
1”
1 1/4”
1 1/2”
2”
ER25W-25

Socket Weld

SW

1/2”2,53602,5360

425

797

Cast steel

SCPH2

3/4”
1”
1 1/4”
1 1/2”
2”
ER25W-451/2”4,46404,4640
3/4”
1”
1 1/4”
1 1/2”
2”
ER25W-651/2”6,49256,4925
3/4”
1”
1 1/4”
1 1/2”
2”

*Available flange standards: ASME/JPI, DIN, JIS

*Customized face-to-face dimensions on request.

Discharge Capacity

ER25

Installation Examples

ER