Features

The empty discharge check valve is installed on the outlet pipe of the high-pressure feed pump of the thermal power unit to prevent the water from flowing back and protect the feed pump. The valve works with the automatic recirculation bypass valve of the minimum flow of the water pump. When the feed pump is under low load or the outlet gate valve is closed, the automatic recirculation bypass valve should be in the open position to ensure the safe operation of the water pump. When the empty discharge check valve is opened, the recirculation bypass valve is automatically closed. It is not suitable for media containing solid particles and high viscosity.

Structural f eatures

1. It has a recirculation and pressure reduction facility, which allows the high-pressure medium to flow through multiple small-diameter bypasses, consuming a large amount of energy and thus reducing the pressure:

2. The valve has a recirculation function only when the flow rate is very low, so that the pump can be cooled. When the pump is operating normally, the recirculation is not turned on, thus saving the electricity and water energy consumed by continuous recirculation.

3. The valve does not require any external energy and is fully automatic;

4. The valve should be installed vertically.

Product standards

Design standards: According to JB/T 3595-2002, NB/T 47044-2014

2. Design standard: ASME B16.34-2013

Nominal pressure: PN25-PN420 (900LB-2500LB)

Nominal thread diameter: DN80-DN350 (3″-14″)

Main material:

1. WCB

2.25#

3. ASTM A216 WCB

4. ASTM A105

Operating temperature: WCB-29°C~425°C

Applicable medium: water

Connection method: flange

Transmission mode: automatic