Turbine bypass valve

The BVT-TB is an angle-style steam conditioning valve, used for both process and turbine bypass applications. It is designed to reduce temperature and pressure of steam to match downstream requirements. Pressure is controlled using a proven trim technology which reveals a series of perforations in the valve cage as the plug moves. Steam is then passed to the outlet through a series of pressure reduction stages, selected specifically for the operating conditions on a case-by-case basis in order to reduce noise. Valve Plug design is optimized for low actuating forces, allowing for smaller and pneumatic actuators. Control of temperature takes place in the outlet, where a number of spring-loaded spray water atomizing nozzles are installed perpendicular to the steam flow. The selection, placement and design of these are chosen to match the desuperheating requirements of the system as well as reducing risk of free water being injected into the downstream piping.

Key features

  • Fully customizable inlet, outlet connections
  • Complies with the following standards: ASME, EN, PED
  • Forged valve body with uniform thickness and trim design optimized to withstand thermal cycling
  • High shut-off class
  • Great rangeability
  • Pressure reduction and desuperheating optimized for each application
  • Smaller actuating forces
  • Simple and quick maintenance
  • Easily exchangeable seat as option for further reduced maintenance downtime

Specifications

Valve sizes
Up to 500 mm seat diameter

Pressure class
Up to ANSI 4500 (higher rating on request)

Design temperature
620 ºC as standard (650 ºC on request)

Leakage class
ANSI Class III, IV, V, MSS SP 61

Rangeability
Up to 25:1 for the complete valve

Regulatory requirements
ASME, EN, PED, IBR, CRN

Materials
Forged material adapted to connecting pipe material

Actuation
Pneumatic, hydraulic or electrical

Options

  • Quick change type seat
  • Erosion resistant trim with long cage
  • Expanded outlet
  • Live load gland seal packings

Under construction