Product Overview

The 814/815/816 Inverted Bucket Steam Trap is a highly efficient and reliable drainage device from Armstrong, featuring cast iron body construction with horizontal installation and side-in side-out design. This type of steam trap is recognized as one of the most reliable steam traps available, capable of meeting the drainage requirements of virtually all steam mains, tracing lines, and steam equipment.

Its core advantage lies in the inverted bucket's ability to operate stably within the cast iron body over extended periods, reducing equipment maintenance frequency and costs while minimizing steam energy waste. The unique structural design provides water hammer resistance, continuous condensate discharge without accumulation, and automatic venting of non-condensable gases such as air and carbon dioxide, ensuring efficient steam system operation.

Working Principle

Core Structure and Operating Mechanism

1. Features a unique lever mechanism that amplifies the gravity of the inverted bucket, enabling smooth opening of the disc under system differential pressure.
2. The lever mechanism uses a free-floating design with no fixed pivot points that cause wear, extending the mechanism's service life.
3. The disc and seat are located at the top of the valve body, preventing debris accumulation at the orifice. Fine particles remain suspended inside the valve and are rapidly discharged with condensate under differential pressure when the inverted bucket sinks and opens the orifice.

Sealing and Venting Design

1. The trap discharge port is completely surrounded by a water seal, effectively preventing fresh steam leakage.
2. A vent hole on the inverted bucket ensures continuous automatic venting of non-condensable gases such as air and carbon dioxide at steam temperature, preventing gas accumulation that affects system efficiency.
3. Although the discharge action is intermittent, condensate discharge remains continuous with no condensate accumulation.

Technical Specifications

Basic Performance Parameters

Parameter	Value
Max Working Differential Pressure	1.7MPa
Max Allowable Pressure (Shell)	1.7MPa @ 232°C
Max Capacity	9072kg/h
Installation	Horizontal
Flow Direction	Side-In Side-Out
Connection Type	Threaded, Carbon Steel Flanged
Test Plug Material	Carbon Steel

Model and Nominal Diameter Reference

Model	Nominal Diameter (DN)	Test Port Size (DN)
814	25, 32	25
815	25, 32, 40, 50	40
816	50, 65	50

Material Specifications

Component	Material
Body	ASTM A48 CL30 Cast Iron
Internal Components	304 Stainless Steel
Disc and Seat	17-4PH H900
Test Plug	Carbon Steel
Flange (Optional)	Carbon Steel

Dimensions and Weight

Dimension Table (Unit: mm)

Model	DN	A	B	C	D	HG20592 PN25 RF (L)	ASME B16.5 CL150 RF (L)	Bolts
814	25	203	346	229	198	310	310	8
814	32	203	346	229	198	350	350	8
815	25	229	413	60	205	350	350	8
815	32	229	413	60	205	350	350	8
815	40	229	413	60	205	350	350	8
815	50	229	413	60	205	350	350	8
816	50	292	541	330	279	500	500	8
816	65	292	541	330	279	500	500	8

Weight Table (Unit: kg)

Model	DN	Threaded	Flanged (HG20592 PN25 RF)
814	25	20.9	22.6
814	32	20.9	24.2
815	25	32.2	34.8
815	32	32.2	36.2
815	40	32.2	37.0
815	50	32.2	38.6
816	50	59.4	66.4
816	65	59.4	68.6

Note: Weights are approximate. Flanged connection weights are based on HG20592 PN25 RF standard; consult supplier for other standards.

Capacity Charts

Optional Configurations

The 814/815/816 Inverted Bucket Steam Trap offers the following optional configurations. Add the corresponding suffix to the model number when ordering:

1. Internal stainless steel check valve (add CV to model)
2. Thermostatic air vent bucket (add T to model)
3. Large vent orifice (add LV to model)
4. Vent cleaning wire for gas drainage (add BVSW to model)
5. Integral cast flange connection (add F suffix: 814F, 815F, 816F)

Ordering Information

When ordering, please clearly specify the following information to ensure the product meets your requirements:

1. Product model (including optional configuration suffix)
2. Nominal diameter (DN)
3. Orifice size
4. Connection type and standard (threaded or flange standard)
5. Required optional configurations

Note: Design, materials, weight, and performance specifications are approximate and subject to change without notice.

Applications

This product is suitable for various steam systems, including but not limited to:

• Condensate drainage from steam mains
• Condensate removal from industrial equipment tracing lines
• Drainage for various steam heating equipment
• Steam systems requiring high efficiency and low maintenance
• Steam applications with water hammer risk