DN400-PN16-RF Metal Seated SS Swing Check Valve

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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Technical Data Sheet

With Counterweight Assisted Closure System

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

  1. 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.

  1. Main Technical Parameters

Tham số

Value / Description

Kích thước danh nghĩa

DN400

Xếp hạng áp suất

PN16 (1.6 MPa / 16 bar)

End Connection

Flanged, Raised Face (RF) — EN 1092‑1 / ASME B16.5 or equivalent

Cấu trúc thân máy

Swing check, metal‑seated, with external counterweight mechanism

Phạm vi nhiệt độ

–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

  1. Bill of Materials (Typical)

No.

Part Name

Standard Material

Optional Material

1

Thân hình

CF8 / CF8M (Stainless Steel)

WCB (Carbon Steel), CF3M, Duplex

2

Đĩa

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)

  1. Các tính năng chính

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.
  1. 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)

Kích thước danh nghĩa

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)

  1. Design & Manufacturing Standards

Tiêu chuẩn

Sự miêu tả

Thiết kế

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)
  1. Installation & Adjustment
  1. 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.
    1. Optional Features

    Option

    Sự miêu tả

    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

    1. Ordering Information

    Please specify the following when placing an order:

    1. Media, operating temperature, and pressure
    2. Body and trim materials — stainless steel, carbon steel, duplex, etc.
    3. Counterweight system details — damper required or not
    4. Flange standard and facing — EN 1092‑1 / ASME B16.5; RF / FF / RTJ
    5. Position feedback requirements — limit switches, positioner
    6. Special certifications — NACE, ATEX, fire safe, low emission, etc.
    7. 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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