Inverted bucket steam trap - ESU5 | Miyawaki | Philippopoulos s.a.
Inverted bucket steam trap - ESU5 | Miyawaki | Philippopoulos s.a.

Inverted bucket steam trap - ESU5 | Miyawaki

Miyawaki ESU5 – Inverted Bucket Steam Trap, Stainless Steel Construction

The Miyawaki ESU5 is a mechanical inverted bucket steam trap designed for small to medium condensate loads. Constructed from stainless cast steel SCS13A / CF8, it is suitable for steam lines requiring enhanced corrosion resistance compared to cast iron versions.

Technical Specifications

  • Sizes: 1/2", 3/4", 1".
  • Connections: Rc, NPT, JIS / ASME / DIN flanges, socket weld.
  • PMA: 2.1 MPa.
  • TMA / TMO: 350 °C.
  • PMO per version: ESU5-3 at 0.3 MPa, ESU5-7 at 0.7 MPa, ESU5-11 at 1.1 MPa, ESU5-16 at 1.6 MPa, ESU5-21 at 2.1 MPa.
  • Body Material: SCS13A / CF8.
  • Compliance: PED 2014/68/EU, Article 4, Section 3, without CE marking.

Operation

The inverted bucket operates the valve assembly based on buoyancy. When condensate accumulates, the bucket loses buoyancy and the seat opens. With steam entry, the bucket rises and the valve closes. A small vent hole at the top of the bucket removes hot air and non-condensable gases, reducing air locking phenomena.

Applications

Suitable for:

  • heat exchangers,
  • unit heaters and heating elements,
  • dryers and small steam processes,
  • food or pharmaceutical equipment,
  • lines requiring stainless steel body.

Supports condensate return with back pressure up to 90% of upstream pressure, provided check valve and isolation valve are installed at the outlet.

Installation and Maintenance

Install with horizontal flow from inlet to outlet and nameplate on top. The steam trap should be positioned lower than the condensate-producing equipment. Maintenance space of over 120 mm is required, and line blow-off before startup is necessary.

FAQ

When to choose over ES5?
When SCS13A / CF8 material is necessary due to corrosion, installation cleanliness, or project specification.

What causes reduced flow?
Exceeding operating pressure, insufficient sizing, clogged vent hole, or debris in the seat.

Standard (Options)
  • DIN
  • ANSI
  • JIS
Connection (Options)
  • BSP
  • NPT
  • Flanged
  • Socket Weld
Material (Options)
  • Stainless Cast Steel (SCS13A)
Pressure Rating (Options)
  • 0,3 - 2,1 Mpa

Description

1978 Received the Award for Excellence in Energy Saving

Features

No condensate logging on primary side

Intermittent or continuous discharge depending on condensate loads means no condensate stacking up on the primary side.

Easy maintenance

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

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.

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.

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).

SCCV_color_big

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

Typical applications

Body and cover made of stainless steel, and suitable for food equipment, medical equipment and other applications.

Dimensions/Weight

Screwed

ESU5_RC
Size (”)Dimensions (mm)Dimensions (in)Weight
LH1H2WLH1H2W(kg)(lb)
1/2”1035769754.12.22.73.01,94.2
3/4”4.12,04.4
1”1094.32,14.6

Flanged

ESU5_FF
Size (”)Dimensions (mm)Dimensions (in)Weight
LH1H2WLH1H2W(kg)(lb)
1/2”1755769756.92.22.73.03,57.7
3/4”1957.73,78.2
1”2158.54,19.0

*Customized face-to-face dimensions on request.

Socket

ESU5_W
Size (”)Dimensions (mm)Dimensions (in)Weight
LH1H2WLH1H2W(kg)(lb)
1/2”2035769758.02.22.73.02,55.5
3/4”2309.12,65.7
1”25410.04,16.2

Specifications

ModelConnection

Max. operating

pressure

Max. operating

pressure differential

Max. operating

temperature

Body material
TypeSize(MPa)(psig)(MPa)(psig)(℃)(℉)
ESU5-3

Screwed

Rc,NPT

1/2”0,3430,343350662

Stainless cast

steel
SCS13A

3/4”
1”
ESU5-71/2”0,71000,7100
3/4”
1”
ESU5-111/2”1,11601,1160
3/4”
1”
ESU5-161/2”1,62301,6230
3/4”
1”
ESU5-211/2”2,13052,1305
3/4”
1”
ESU5F-3

Flanged

JIS, ASME, DIN

1/2”0,3430,343
3/4”
1”
ESU5F-71/2”0,71000,7100
3/4”
1”
ESU5F-111/2”1,11601,1160
3/4”
1”
ESU5F-161/2”1,62301,6230
3/4”
1”
ESU5F-211/2”2,13052,1305
3/4”
1”
ESU5W-3

Socket Weld

JIS, ASME, DIN

1/2"0,3430,343
3/4"
1"
ESU5W-71/2"0,71000,7100
3/4"
1"
ESU5W-111/2"1,11601,1160
3/4"
1"
ESU5W-161/2"1,62301,6230
3/4"
1"
ESU5W-211/2"2,13052,1305
3/4"
1"

*Customized face-to-face dimensions on request

Discharge Capacity

ESU5_1

Installation Examples

ES_haikan

●To keep the drawing simple, bypass lines, valves, and other required equipment are not displayed. 

●If you wish to recover condensate, attach a check valve (CV model) and shut off valve on the trap’s outlet side.