DN400-PN16-RF Metal Seated SS Swing Check Valve

Nominal Size DN400
Pressure Rating PN16 (1.6 MPa / 16 bar)
End Connection Flanged, Raised Face (RF) — EN 1092 1 / ASME B16.5 or equivalent
Body Construction Swing check, metal seated, with external counterweight mechanism
Temperature Range –29°C ~ +400°C (depending on seat hardfacing material)
Applicable Media Water, steam, oil, corrosive fluids, high temperature services
Flange Standard EN 1092 1 PN16 / ASME B16.5 Class 150 (customer specified)
Face to Face EN 558 Series 1 / ASME B16.10 / API 6D

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DN400-PN16-RF Metal Seated SS Swing Check Valve

Technical Data Sheet

With Counterweight Assisted Closure System

Product: DN400 – PN16 Flanged Metal Seated Stainless Steel Swing Check Valve with Counterweight

Product Description

This large‑diameter flanged swing check valve features a metal‑to‑metal seated design and is equipped with a counterweight assisted closure system. The disc opens automatically under forward flow. When flow decelerates or a reverse flow tendency occurs, the counterweight, acting through a lever mechanism, rapidly assists disc closure. This significantly reduces closure time and mitigates water hammer, protecting the piping system. The valve is widely used at pump discharges, high‑pressure pipelines, and long‑distance transmission systems where reliable check performance is critical.

Main Technical Parameters

매개변수	Value / Description
공칭 크기	DN400
압력 등급	PN16 (1.6 MPa / 16 bar)
End Connection	Flanged, Raised Face (RF) — EN 1092‑1 / ASME B16.5 or equivalent
차체 구조	Swing check, metal‑seated, with external counterweight mechanism
온도 범위	–29°C ~ +400°C (depending on seat hardfacing material)
Applicable Media	Water, steam, oil, corrosive fluids, high‑temperature services
Flange Standard	EN 1092‑1 PN16 / ASME B16.5 Class 150 (customer specified)
Face‑to‑Face	EN 558 Series 1 / ASME B16.10 / API 6D

Bill of Materials (Typical)

No.	Part Name	Standard Material	Optional Material
1	몸	CF8 / CF8M (Stainless Steel)	WCB (Carbon Steel), CF3M, Duplex
2	디스크	CF8 / CF8M	CF3M, 17‑4PH, Monel
3	Seat / Disc Hardfacing	Stellite® 6	316 SS hardened, Tungsten Carbide
4	Seat Ring	A182 F316	A105 (for carbon steel body)
5	Arm / Lever	CF8 / CF8M	Carbon steel with coating
6	Hinge Pin	A182 F316	17‑4PH, Inconel
7	Cover / Bonnet	CF8 / CF8M	Same as body
8	Counterweight System	Lever arm + counterweight (cast iron / cast steel)	Adjustable counterweight, stainless steel weights
9	Linkage / Bushings	Carbon steel (galvanized / coated)	Stainless steel
10	Body Gasket	Spiral wound (SS + graphite)	Metal ring gasket
11	Fasteners	A193 B8 (Stainless)	A193 B7 (Carbon steel)

주요 특징

4.1 Counterweight Assisted Closure

Fast closing: When flow reverses or slows, the counterweight provides additional torque to close the disc quickly, reducing water hammer pressure spikes.
Adjustable closing torque: The counterweight position can be moved along the lever arm to optimize closure speed for specific operating conditions.
Optional hydraulic damper: A damper or dashpot can be installed on the lever arm to smooth the final closing stroke, eliminating slamming and noise.

4.2 Metal‑to‑Metal Seating

Hardfaced seat and disc (Stellite® or equivalent) offer excellent wear, erosion, and high‑temperature resistance.
Suitable for high differential pressure, abrasive media, and elevated temperatures.

4.3 Low Pressure Drop

Full‑port flow path and disc that opens to 80°–90° under normal flow minimize pressure loss.

4.4 Reliable Pivot Design

Pin and bushings are made from wear‑resistant materials; lubrication points ensure smooth disc movement and long‑term reliability.

Dimensions & Weight (Reference)

Dimensions are typical for EN 1092‑1 PN16 RF flanges. The counterweight assembly dimensions vary based on site layout; final dimensions to be confirmed from certified GA drawings.

Item	Dimension (mm)
공칭 크기	DN400
Face‑to‑Face (L)	Approx. 600 – 650 mm
Flange Outer Diameter (D)	Approx. 580 mm
Flange Thickness (b)	Approx. 30 – 36 mm
Bolt Circle Diameter (K)	Approx. 525 mm
Bolt Hole Diameter (d)	Approx. 30 mm
Number of Bolt Holes	16
Body Height (H1)	Approx. 600 – 700 mm
Lever Arm Length	Approx. 800 – 1200 mm (site dependent)
Overall Height (H_total)	Approx. 1200 – 1600 mm
Counterweight Mass	Approx. 50 – 100 kg (calculated per service)
Approx. Total Weight	350 – 500 kg (including counterweight)

Design & Manufacturing Standards

기준	설명
설계	API 6D, ASME B16.34, BS 1868, EN 12334
Pressure‑Temperature Rating	ASME B16.34, EN 1092‑1
Face‑to‑Face	EN 558 Series 1, ASME B16.10, API 6D
Flange Connections	EN 1092‑1 PN16, ASME B16.5 Class 150 (as specified)
Inspection & Testing	API 598, ISO 5208, EN 12266‑1

Testing:

Shell strength test: 1.5 × rated pressure
Seat leakage test: Per API 598 (metal seat allows minimal leakage; soft seat optional for zero leakage)

Installation & Adjustment

Orientation

Install with flow direction matching the arrow on the body.
For horizontal pipelines, the lever arm must be vertical (upward) to ensure proper counterweight effect.

Counterweight Adjustment

Preliminary counterweight position is set at factory based on design conditions.
After installation, adjust the weight position along the lever arm to achieve optimal closing speed without excessive water hammer.

Hydraulic Damper (if equipped)

Fill with specified hydraulic oil and adjust the damping needle valve to control closing speed.

Clearance

Ensure sufficient space around the counterweight swing path to avoid interference with adjacent equipment.

Optional Features

Option	설명
Hydraulic Damper	Installed on the lever arm to absorb closing impact and reduce noise/vibration
Position Indicator	Visual indication of disc position (open/closed)
Limit Switches	Electrical feedback for open/closed status
Soft Seat	PTFE or elastomer seat for bubble‑tight shut‑off
Low‑Emission Packing	For VOCs and fugitive emission control applications
NACE Compliance	MR0175 / MR0103 for sour service

Ordering Information

Please specify the following when placing an order:

Media, operating temperature, and pressure
Body and trim materials — stainless steel, carbon steel, duplex, etc.
Counterweight system details — damper required or not
Flange standard and facing — EN 1092‑1 / ASME B16.5; RF / FF / RTJ
Position feedback requirements — limit switches, positioner
Special certifications — NACE, ATEX, fire safe, low emission, etc.
Additional documentation — material test reports (EN 10204 3.1), pressure test reports, NDT reports

Disclaimer: This technical data sheet is for reference only. Final dimensions, materials, and counterweight configuration are subject to approved engineering drawings and the purchase agreement. Counterweight adjustment should be performed by qualified engineers on site based on actual system conditions.

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