Skip to main content

Utility

  • About
    • CIRCOR Operating System
    • CIRCOR Difference
    • Leadership
    • Events
    • Locations
  • Investors
  • Contact
  • Careers
  • Newsroom
  • Blog

User account menu

  • Log in
Search Close search
Circor

Main navigation

  • Products
    • Search
    • Pumps
    • Valves
    • Regulators
    • Actuators
    • Switches
    • Launchers
    • Motors
    • Accessories
    • Sensors
    • Skids & Packages
    • Systems
    • Delayed Coking
    • Fluid Catalytic Cracking
  • Brands
    • Aerodyne Controls
    • Allweiler
    • Circle Seal Controls
    • CIRCOR Aerospace
    • CIRCOR Bodet
    • CIRCOR Industria
    • CIRCOR Motors
    • DeltaValve
    • Hale Hamilton
    • Houttuin
    • IMO
    • IMO AB
    • Leslie Controls
    • Portland Valve
    • R.G. Laurence
    • RTK
    • Schroedahl
    • TapcoEnpro
    • Tushaco
    • Warren
    • Zenith
  • Industries
    • Industrial
    • Power Generation
    • Commercial Aerospace
    • Commercial Marine
    • Defense
    • Oil & Gas
      • Terminal Fluid Handling Solutions
    • Industrial Gases
    • Life Science
  • Sales partners
  • CIRCORSmart
  • Resources
  • Pump Showroom

Main navigation

  • Products
    • Search
    • Pumps
    • Valves
    • Regulators
    • Actuators
    • Switches
    • Launchers
    • Motors
    • Accessories
    • Sensors
    • Skids & Packages
    • Systems
    • Delayed Coking
    • Fluid Catalytic Cracking
  • Brands
    • Aerodyne Controls
    • Allweiler
    • Circle Seal Controls
    • CIRCOR Aerospace
    • CIRCOR Bodet
    • CIRCOR Industria
    • CIRCOR Motors
    • DeltaValve
    • Hale Hamilton
    • Houttuin
    • IMO
    • IMO AB
    • Leslie Controls
    • Portland Valve
    • R.G. Laurence
    • RTK
    • Schroedahl
    • TapcoEnpro
    • Tushaco
    • Warren
    • Zenith
  • Industries
    • Industrial
    • Power Generation
    • Commercial Aerospace
    • Commercial Marine
    • Defense
    • Oil & Gas
      • Terminal Fluid Handling Solutions
    • Industrial Gases
    • Life Science
  • Sales partners
  • CIRCORSmart
  • Resources
  • Pump Showroom

Utility

  • About
    • CIRCOR Operating System
    • CIRCOR Difference
    • Leadership
    • Events
    • Locations
  • Investors
  • Contact
  • Careers
  • Newsroom
  • Blog

User account menu

  • Search
  • Log in

Breadcrumb

  1. Home /
  2. Our Products /
  3. Valves

TDL Pump protection valve for centrifugal pumps- Compact pump protection - high bypass flow

Function
The outlet main flow controls the non-return valve and positions it in proportion to the flow. The stem of the non-return valve transmits the motion via a lever to the bypass. The bypass system regulates the bypass flow in a modulating way and reduces the pressure to the bypass outlet pressure level without cavitation.
When the non-return valve is completely closed, the entire minimum flow is routed through the bypass. The bypass is fully closed when the non- return valve is in its upper position, thereby allowing full pump flow to the system.

Flow sensitive modulating bypass control
The non-return valve moves upwards with increasing main flow and downwards with decreasing flow. The non-return valve transmits this movement to the control lever.
The movement of the control lever is transferred to the control bushing. This opens the control holes in the control head by a greater or lesser degree. The opening characteristic is linear. Applicable for differential pressures up to 40 bar. Standard with non-return function.

Manual bypass options for TDL valves
Depending on the plant design or additional requirements, various options can be selected for the start-up / warm-up side (A) and for the bypass side (B).

Option A:
One frequently used option is to feed low pressure flow to the process / boiler via the manual start-up. Either for the warm-up process or for heating the adjacent pumps/systems.

Option B:
Depending on the operating conditions of the system (dirt, certain load cases, etc.), special internal parts can be selected for the bypass. The valve is then supplied with the integrated optional bypass set. In this case the original internal parts for the bypass are supplied and installed after commissioning.
 

ARV_TDL_Schnitt
    General information
    Brand:
    Schroedahl
    Type:
    Pump protection
    Category
    Valves > Pump protection
    Markets
    Industrial > Pulp & Paper
    Paints & Colors
    Industrial > Mining
    Industrial > Chemical
    Industrial > Food & Beverages
    Industrial > Nuclear
    Industrial > Petrochemical
    Textile
    Industrial > Heating and Cooling
    Industrial > Industrial Boilers
    Product Design
    Inline
    Benefits

    Product features
    - Automatically modulating bypass function
    - Carbon steel or stainless steel
    - Special materials possible (e.g. Super Duplex)
    - Internal operation (no external energy source required)
    - Easy to install
    - Low maintenance
    - Suitable for all liquids

    Performance data

    Technical data
    Nominal diameter: DN 25 – 500 / NPS 1 – 20
    Pressure class: PN 10 – 160 / Class 150 – 900
    Temperature (max.): Up to 230 °C / 446 °F (other temperatures on request)
    Housing material: 1.0460 / A105
    1.0571 / LF2
    1.4404 / F316L
    1.4462 / F51
    1.4501 / F55
    Housing type: Forged or cast
    Media: Liquids of all kinds (water, oils, chemicals and others)
    Flanges: EN 1092-1, ASME B16.5, ISO 7005, JIS, JPI, (welding ends on request)
    Designs: Vertical installation, horizontal installation, manual start-up, enlarged nominal width of the bypass, degassing connection
    Number of stages (max.): 1
    Number of controlled stages (max.): 1
    Operating range (max.) : Delta p up to max. 40 bar
    Other: Bypass differential pressure up to 40 bar

    Construction features

    Installation information
    The TDL valve should be installed as close as possible to the discharge port of the centrifugal pump, preferably directly on the pump discharge port of the pump.
    To avoid frequency interference due to pressure oscillations in the medium, the distance between the pump outlet and the valve inlet should not exceed 3 m. Take care to ensure a straight inlet section. Exceptions have to be confirmed to SCHROEDAHL.

    Vertical installation is preferred, but horizontal installation is also possible upon request. TDL valves operate at a low noise level and ensure a high reliability due to their sturdy design.
    The recommended filter at the pump inlet should have a mesh size of 0.3 to 0.5mm. A smaller mesh size of 0.1mm is recommended for commissioning.

    Other information
    Bypass differential pressure up to 40 bar
    Data

    Design Standard

    Design standard ANSI:
    Yes
    Design standard DIN:
    Yes

    Unit

    Unit Metric:
    Yes
    Unit Imperial:
    Yes

    Temp

    Max C°:
    230.00
    Max F°:
    446.00

    Pressure Rating

    Pressure rating PN:
    PN 40,
    PN 63,
    PN 10,
    PN 100,
    PN 16,
    PN 160,
    PN 25
    Pressure rating class:
    150,
    300,
    600,
    900

    Nominal size

    Nominal Size [mm] (DN):
    100,
    125,
    150,
    200,
    25,
    250,
    300,
    32,
    450,
    50,
    500,
    350,
    65,
    80,
    40,
    400
    Nominal Size [Inch] NPS:
    4,
    5,
    6,
    18,
    1,
    1.5,
    10,
    12,
    14,
    16,
    2,
    3,
    2.5,
    20,
    8

    Housing

    Housing Material:
    1.0460 / A105,
    1.0571 / LF2,
    1.4404 / F316L,
    1.4462 / F51,
    1.4501 / F55
    Housing Type:
    Forged,
    Cast

    Stages

    Number of stages:
    1
    Number of controlled stages:
    1

    Other data

    Fluids:
    All liquids
    Auxiliary Energy (Actuation):
    Not Applicable
    Stem packing:
    Not Applicable
    Fail-Safe Function:
    Off
    Flanges:
    EN 1092-1,
    ASME B16.5,
    ISO 7005,
    JIS,
    JPI,
    welding ends on request
    Operating range:
    Delta p up to max. 40 bar
    Images
    ARV_TDM_TDL_frontal
    ARV_TDM_TDL_frontal
    Files
    application/pdf, 15.98 MB Download
    Contact
    Contact

    Schroedahl Customer Care

    SCHROEDAHL GmbH

    - A subsidiary of Circor International -

    Alte Schönenbacher Str. 4
    51580 Reichshof-Mittelagger
    Germany

    Phone +49 2265 9927-0
    Fax +49 2265 9927-947
    schroedahl@circor.com

    Circor
    • Privacy
    • Cookie Preferences
    • Feedback
    • LinkedIn
    • YouTube
    • Twitter

    © CIRCOR International, Inc. All Rights Reserved, 2023