TDC Pump protection valve for high pressure centrifugal pumps
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 lever is transmitted via a piston to the multi-stage vortex plug. The minimum flow is then bypassed in a modulating way over several pressure reduction stages.
The TDC can be used for differential pressures above 20 bar up to 250 bar for drainage.
General information
Product features
- Particularly robust design for descaling applications
- Automatically modulating bypass function
- Forged housing material, carbon steel or stainless steel
- Special material possible
- Internal operation (no external energy source required)
- Easy to install
- Low maintenance
- Design optimised for frequent switching cycles
Technical data
Nominal diameter: DN 80 – 250 / NPS 3 – 10
Pressure class: PN 100 – 400 / Class 600 – 2500
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
Media : Descaling water (other liquids possible)
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
Number of stages (max.): 8
Number of controlled stages (max.): 8
Operating range (max.) : Delta p up to max. 230 bar
Other: Bypass differential pressure 20 – 250 bar
Installation information
The TDC 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_x001E_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. TDC valves operate at a low noise level and ensure a high reliability due to their sturdy design.
Data
Design Standard
Unit
Temp
Pressure Rating
Nominal size
Housing
Stages
Other data
Images
Files
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