Inverted bucket steam trap - ESH8N | Miyawaki

Name: Inverted bucket steam trap ESH8N by Miyawaki for high pressure
Brand: Miyawaki
SKU: Inverted bucket steam trap - ESH8N | Miyawaki

Miyawaki ESH8N – Inverted Bucket Steam Trap for High Pressure

The Miyawaki ESH8N is a mechanical inverted bucket steam trap made from cast steel WCB, designed for medium condensate loads and medium to high-pressure steam networks. Discharge is based on the buoyancy of the bucket, operating without electrical or pneumatic actuators.

Technical Specifications

Sizes: 1/2", 3/4", 1".
Connections: Rc, NPT, socket weld, FF/RF flanges.
Flange standards: ASME/JPI, DIN, JIS.
Body material: cast steel SCPH2 / WCB.
ESH8N-21: PMO 2.1 MPa, PMA 4.4 MPa.
ESH8N-45: PMO 4.4 MPa, PMA 4.4 MPa.
TMO / TMA: 400 °C.
PED 2014/68/EU, Article 4, Section 3, non-CE marked.

Operation and Selection

The inverted bucket closes the seat when steam is present and opens when condensate level reduces buoyancy. The SCCV System minimizes eccentricity in the valve/seat assembly. A small vent hole in the bucket removes hot air and non-condensable gases, reducing air locking.

Applications

Suitable for steam transport lines, small heat exchangers, food processing, dyeing, cleaning facilities, and HVAC, where pressure resistance greater than cast iron ES8N/ES12N is required. Supports condensate recovery with backpressure up to 90% of upstream pressure, provided check valve and isolation valve are installed at the outlet.

Installation and Maintenance

Installation requires horizontal flow, following the arrow and plate on the top side. Blow-off is needed before startup to remove deposits. Maintenance space of over 180 mm above and 80 mm laterally is recommended.

Standard (Options)

DIN
ANSI
JIS

Connection (Options)

BSP
NPT
Flanged
Socket Weld

Material (Options)

Cast Steel

Pressure Rating (Options)

2,1 - 4,4 Mpa

Description

Option- Customized flange face-to-face - ASTM available

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 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

Screwed

Size (”)	Dimensions (mm)				Dimensions (in)				Weight
	L	H1	H2	W	L	H1	H2	W	(kg)	(lb)
1/2”	220	114	111	147	8.7	4.5	4.4	5.7	11,0	24.2
3/4”
1”	224				8.8

Socket Weld

Size (”)	Dimensions (mm)				Dimensions (in)				Weight
	L	H1	H2	W	L	H1	H2	W	(kg)	(lb)
1/2”	220	114	111	146	8.7	4.5	4.4	5.7	11,0	24.2
3/4”
1”

Flanged

Size(")	Dimensions(mm)				Dimensions(in)
	L	H1	H2	W	L	H1	H2	W
1/2"	250	114	111	146	9.8	4.5	4.4	5.7
3/4"
1"

Size(")	Weight(kg)									Weight(lb)
	JIS(FF,RF)		JIS(RF)		ASME/JPI(RF)			DIN		JIS(FF,RF)		JIS(RF)		ASME/JPI(RF)			DIN
	10K,16K	20K	30K	40K	150lb	300lb	600lb	PN40	PN100	10K,16K	20K	30K	40K	150lb	300lb	600lb	PN40	PN100
1/2"	11,0	11,0	12,4	12,8	11,4	12,1	12,1	11,3	12,2	24.2	24.2	27.3	28.2	25.1	26.6	26.6	24.9	26.9
3/4"	12,4	12,4	13,7	14,0	11,8	12,8	13,2	12,9	15,0	27.3	27.3	30.2	30.8	26.0	28.2	29.1	28.4	33.0
1"	13,2	13,6	14,6	15,0	12,4	13,6	14,0	15,0	18,3	29.1	29.9	32.1	33.0	27.3	29.9	30.8	33.0	40.3

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

*Customized face-to-face dimensions on request.

Specifications

Model	Connection		Max. operating pressure		Max. operating pressure differential		Max. operating temperature		Body material
	Type	Size	(MPa)	(psig)	(MPa)	(psig)	TMO(℃)	TMO(℉)
ESH8N-21	Screwed Rc,NPT	1/2”	2,1	305	2,1	305	400	752	Cast steel SCPH2/WCB
		3/4”
		1”
ESH8N-45		1/2”	4,4	640	4,4	640
		3/4”
		1”
ESH8NF-21	Flanged FF,RF	1/2”	2,1	305	2,1	305
		3/4”
		1”
ESH8NF-45		1/2”	4,4	640	4,4	640
		3/4”
		1”
ESH8NW-21	Socket Weld SW	1/2”	2,1	305	2,1	305
		3/4”
		1”
ESH8NW-45		1/2”	4,4	640	4,4	640
		3/4”
		1”

●ESH8N-21 PMA: 4,4MPa (640psig), TMA: 400℃ (752℉), PMO: 2,1MPa (305psig), TMO: 400℃ (752℉)

●ESH8N-45 PMA: 4,4MPa (640psig), TMA: 400℃ (752℉), PMO: 4,4MPa (640psig), TMO: 400℃ (752℉)