Three-Way Bypass Valves

Product Introduction

What is Feed water heater three way valve?

Feed water heater three way valve is designed for high pressure heater operation and isolation/switching. According to the customer’s pipeline, the inlet and outlet can be designed as a three-way valve or the inlet can be designed as a three-way gate, and the outlet can be designed as an angle valve or a gate valve. Control methods include hydraulic actuators, electric actuators, etc.

The feedwater bypass system remains on standby at all times. If a heater problem causes the water level to rise, the feedwater bypass will operate immediately. It can automatically control the feedwater bypass system by monitoring the water level. When the water level rises, the feed water bypass acts, and the bypass is realized by turning the feed water to the heater, and the heater is kept warm at the same time.

Specifications of Feed water heater three way valve:

Nominal diameter: DN 150-DN600 (6″-24″)

Temperature: 350℃ (depending on the specific situation)

Pressure: ANSI 600LB~4500LB (commonly used CLASS 2500)

Valve Type: Z-Type, Straight Through, Forged, Cast

Material: carbon steel, alloy steel

Decorative material: According to API600

Operation mode: electric, hydraulic

Connection method: welding

Structural features of Feed water heater three way valve:

1. The sealing surface is welded by cobalt-based alloy, which has the properties of long service life, friction reduction, wear resistance and tight sealing.

2. Specially designed for peak shaving operations and frequent starts. It avoids material concentration and sudden changes in wall thickness. Also, it withstands pressure evenly. It is beneficial to maintain the concentricity of the entire valve. More importantly, it improves sealing performance and requires less operating force.

3. According to customer requirements, the material of the valve body is forged WCB or cast WB36, which matches the material of the high-pressure water supply pipe, and can be directly welded without transition section.

4. The position of the upper sealing shaft is fixed to ensure that the stroke is inflexible, can be scheduled, and is easy to operate; the steam has a guiding structure with stable opening and closing and minimal wear resistance.

5. The head of the valve stem adopts a disc spring to ensure sufficient preload.

6. The steam is stainless steel, and the parts are surface-hardened.

Design features of Feed water heater three way valve:

Cavity pressure self-sealing

Fully guided valve

Sealed Carbide

Stem surface treatment ENP

Application of Feed water heater three way valve:

High Pressure Feed Water Heater Bypass

Low pressure feedwater heater bypass

Double safety valve device

Continuous Process Applications

HRSG Economizer

Bulk Tank Switching

Advantages of Feed water heater three way valve:

1. Protects feedwater heater steam jackets against ruptures and leaks

2. Protects turbine extraction from excessive back pressure

3. Allows isolation of feedwater heater bypass without interrupting water circulation

4. Feedwater heater can be bypassed during plant startup and low turbine loads

5. Allows heaters to be bypassed at peak loads to increase turbine power output and improve overall plant efficiency

6. easy to maintain

Other names for three-way valve:

3 way port valve

3 way steam valve

electric three way valve

electric 3 way valve

manual 3 port valve

ss 3 way valve

3 way stainless valve

manual three way valve