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You are here: Home / Products / Controls / Control / Product - BE Boiler Start-up Valve

Product - BE Boiler Start-up Valve

Once-through boilers require a minimum evaporator flow to cool the boiler tubes during start-up (minimum evaporator flow for spiral wound evaporators is approximately 30%). A recirculation system recirculates water out of the water separator back into the feedwater tank or to the economiser/evaporator to ensure the minimum evaporator flow. Different layouts of the recirculation system exist, recirculation of the water from the separator back to the feed water tank and water recirculation from the separator back to the economiser inlet with a recirculation pump. In addition to the above operating modes the start-up valves can be used during boiler-filling and evaporator (air) purging.This operating mode typically requires high flow at low differential pressure.

Key features

Trim design

Seat room purging: The trim is designed with a control edge upstream of the seat which shuts off the flow path for potentially damaging particles before the plug reaches the seat.
Vena contracta separate from seat: In normal control mode the smallest flow area of the trim is downstream of the seat, keeping potential erosion away from the seat.
Controlled gradual flow diversion: In the critical high velocity area, special care is taken to achieve a gradually controlled flow diversion preventing erosive water steam mixture hitting trim surfaces with high velocity.
Anti-erosion coating on control surface: Proven, hard anti erosion coating to ensure long life time of the trim.

Flashing conditions

Flashing water is highly erosive if it hits body or trim parts with high velocity. This must be avoided by design or the parts which are hit must be erosion resistant.

An angle over-the-plug configuration with its straight outlet for the flashing steam is therefore the most favourable configuration. A rapid increase of flow diameter at the point where the medium expands, avoids erosion downstream of the valve.

In the Z-shaped valve body, an outlet cage is needed to protect the body. It is recommended to have a straight pipe run downstream of the valve because the flashing water will also erode pipe bends.

Debris

Boiler start-up valves often experience debris, because the water separator is typically the debris collector of the boiler. On the other hand the valve has to be absolutely tight for long operating periods. If the seat is only slightly damaged by debris which has been clamped between seat and plug, then continuous leakage of flashing water will quickly erode the seat further and increase the seat leakage. This will lead to severe damage of the valve. Therefore the trim design should prevent particles being trapped between seat and plug when the valve is closing.

Benefits

Specifically designed as a separator drain valve for supercritical boilers.
For operation with flashing water (saturated condition at the inlet).
Quick change trim for easy maintenance.
Seat area purging reduces particle damage.
Angle and Z-shaped body design available.
For easy inspection and maintenance, none of the internals are welded or bolted to the body or bonnet.
Block tight according to MSS-SP61 or EN 12266-1 Class B.

Product specification

Design code

EN 12516-2, others upon request

Body style

Angle type; Flow-to-close

Z-type, Flow-to-close

Fluid data range

Inlet: 320bar / 450°C; Outlet: 60bar / 300°C

Pipe connection

Butt-welding according to customer requirement

Other connection types upon request

Trim

Unbalanced, quick change trim

Actuation

Double-acting hydraulic actuator

Seat/stem tightness

EN 12266-1 Cl. B or MSS-SP61or ANSI/FCI 70.2 Cl. V

Serviceability

Replaceable stem/plug, seat, inlet cage, outlet cage (Z-type design)

Bolted bonnet

Options

Transition pieces for large pipe diameters and material compatibility

Orientation

Standard actuator vertical up, others upon request

Typical materials

General information

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IMI_CCI_BE.pdf

Contacts

Global sales:
imicci.sales@imi-critical.com

Key features

Flashing water is highly erosive if it hits body or trim parts with high velocity. This must be avoided by design or the parts which are hit must be erosion resistant.

Benefits

Product specification

Typical materials

General information

Latest News

Downloads

Contacts

Sitemap

Product finder

Key features

Flash​ing water is highly erosive if it hits body or trim parts with high velocity. This must be avoided by design or the parts which are hit must be erosion resistant.

​Benefits​

​​Product specification

​Typical materials​

General information

Latest News

Downloads

Contacts

Sitemap

Flashing water is highly erosive if it hits body or trim parts with high velocity. This must be avoided by design or the parts which are hit must be erosion resistant.

Benefits

Product specification

Typical materials