API Swing Check Valve HN104

Product Overview

The HN104 API Swing Check Valve is designed for non-return service in ANSI pipeline systems. The swing disc construction helps prevent reverse flow in oil, gas, steam, water and compatible industrial media where one-way flow protection is required.

This valve series follows API and ASME design conventions for cast steel swing check valves. Typical configurations include bolted cover construction, swing-type disc operation, replaceable seat construction, non-penetrating disc shaft design, and RF, BW or RTJ end connections depending on pressure class and project requirements.

HN104 is available across Class 150, 300, 600, 900, 1500 and 2500 reference data. Final size range, material grade, end connection and test requirements should be confirmed according to the approved project specification.

Key Features

• API swing check valve for ANSI non-return pipeline service.
• Swing-type disc helps prevent reverse flow while allowing forward flow through the valve.
• Bolted cover construction for standard cast steel check valve configurations.
• Replaceable seat construction for project-based trim selection.
• Non-penetrating disc shaft design based on catalog reference.
• RF, BW and RTJ end options depending on pressure class and project requirement.
• Suitable for horizontal or vertical pipeline installation when confirmed against flow direction and project conditions.

Sectional Structure and Materials

The numbered sectional drawing corresponds to the position numbers in the materials table. Final material selection should be confirmed according to pressure class, working temperature and medium compatibility.

Pos.	Parts Name	Carbon Steel	1 1/4Cr-1/2Mo	Low Temp Carbon Steel
1	Body	A216-WCB	A217-WC6	A352-LCB
2	Bonnet	A216-WCB	A217-WC6	A352-LCB
3	Disc	A105-CR13	A182-F11 + HF	A350-LF2 + CR13
4	Rocker	A216-WCB	A217-WC6	A352-LCB
5	Lifting hook	A216-WCB	A217-WC6	A352-LCB
6	Seat	A105-CR13	A182-F11 + HF	A350-LF2 + CR13
7	Pin shaft	A276-420	A276-304	A276-420
8	Gasket	Carbon steel	A276-304	Carbon steel
9	Disc nut	Carbon steel	A194-7	Carbon steel
10	Disc bolt pin	Carbon steel	A276-420	Carbon steel
11	Bonnet gasket	Spiral wound gasket + 304	Spiral wound gasket + 304	Spiral wound gasket + 304
12	Bonnet bolt	A193-B7	A193-B16	A320-L7
13	Bonnet nut	A194-2H	A194-7	A194-4
14	Lifting ring	Carbon steel	A276-304	A276-316

Alternative materials may be selected according to medium, temperature and project specification.

Technical Specifications

Dimensions and Performance Data

The following dimensions are catalog reference values in millimeters. Final dimensions and end connection details should be confirmed against the approved drawing before order.

Design and Construction Options

Available construction options may include eyebolt cover lifting, bolted bonnet, pressure self-seal bonnet, RF, RTJ and BW end configurations, internal or outside disc shaft arrangements, and screwed or welded seat construction depending on project requirements.

Catalog design references also include swing disc construction, replaceable seat options, non-penetrating disc shaft design, and horizontal or vertical installation subject to flow direction and project review.

Applications

• Oil and gas pipeline non-return service
• Petrochemical and refinery process lines
• Power plant steam, water and auxiliary systems
• General industrial ANSI pipelines
• Water, steam, oil and compatible gas service
• Pipeline systems requiring API/ASME non-return valve specifications

Standards and Compliance

• Design reference: BS 1868 / API 6D
• Pressure-temperature reference: ASME B16.34
• Face-to-face / end-to-end reference: ASME B16.10
• Flange reference: ASME B16.5
• Butt-weld end reference: ASME B16.25
• Test and inspection reference: API 598 / API 6D

Technical data is based on catalog reference information. Final dimensions, material grades, end connections and installation direction should be confirmed according to project specification and approved drawings.

Frequently Asked Questions

What is HN104 mainly used for?

HN104 is mainly used for non-return service in ANSI pipeline systems where reverse flow protection is required.

Which pressure classes are available?

The catalog reference covers Class 150, 300, 600, 900, 1500 and 2500. The available size range depends on the selected pressure class and end connection.

Can HN104 be supplied with RF, BW or RTJ ends?

Yes. Raised face, butt-weld and RTJ end configurations may be selected according to pressure class, piping design and project specification.

Can HN104 be installed vertically?

The catalog reference includes horizontal or vertical installation, but the final installation direction should be confirmed according to flow direction and project engineering review.