SEMPELL DEWRANCE CHECK VALVES SIDE MOUNTED EXTRACTION CHECK VALVE

FEATURES:

• The disc will freely close as a result of reversed flow.

• Complete disc closure at no flow conditions is assured by an off-set between the seating surface and the lever.

• The disc is provided with an anti-rotational device to avoid damage due to induced flow instability.

• Free swinging disc operation when the actuator is in open position (pressurized cylinder and compressed spring).

• A vertical seat design, a large opening angle of the disc (75°) and an accurate design of the internal geometry gives a very limited internal turbulence. This results in reduced pressure loss.

• During the fast air exhaust the compressed spring allows a closure in less than 1 sec (the complete seat closure will be effective only when the steam flow becomes zero).

• The actuator action is limited to the first part of the stroke leaving a free swinging motion of the disc for few degrees when it is near the closed position. This avoids possible deformation by repeated internal shocks by forced closure.

• The standard actuator configuration includes: limit switches, pressure gauge and filter, quick exhaust valve and local closure test device.

• Quarter turn actuators assures the safety conditions for operators.

SPECIFICATIONS:

• Standard design: ASME B16.34

• Pressure ratings: ASME 150 to 1500

• Size: DN 150 to 1500 (NPS 6 to 60)

• Material: carbon steel, low alloy steel, stainless steel

• Trim: stainless steel 13 % Cr (trim 1 acc to API 600)

• End connection: flanged or butt weld ends

• Installation: horizontal

• Actuator: pneumatic or hydraulic actuator

TECHNICAL DATA

• Standard design: ASME B16.34

• Pressure ratings: ASME 150 to 1500

• Size: DN 150 to 1500 (NPS 6 to 60)

• Material: Carbon steel, Low alloy

• steel, Stainless steel

• Trim: Stainless steel 13 % Cr (trim 1 acc to API 600)

• End connection: Flanged or butt weld ends

• Installation: Horizontal

• Actuator: Pneumatic or hydraulic actuator

GENERAL APPLICATION

The valves prevent backflow of steam from feed water heaters, auxiliary turbines and other

equipment to the main turbine after sudden load reductions or turbine trip.

Conventional power plants (coal and oil):

• Steam turbine extraction lines

• Water line, for the pump protection

Natural gas combined cycle:

• Cold reheat non return

Refineries and petrochemical plants,

for compressor protection:

• Fluid catalytic cracking air blower discharge

• Compressor discharge lines and in process application