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Siemens Combustion VGD20.323U Double Gas Valve Body Controls 1.25" NPT

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Special Price $997.32 Regular Price $1,107.03
In stock
SKU
VGD20.323U
The Siemens Combustion VGD20.323U Double Gas Valve Body is a high-performance part that is used in commercial and industrial gas-fired HVAC systems. This has a 1.25” NPT connection and is designed to control the flow of gas to the burners to improve combustion and safety. This type of valve also works as a double block valve to ensure safety in the regulation of the gas. It is designed with strength and dependability for low emission efficient fuel consumption and safety requirements. It is easy to connect with Siemens gas control actuators and is well suited to boilers furnaces and other heating applications where safe and efficient gas regulation is essential.
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HVAC Controls & Electrical, Valves
Manufacturer:
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Product Overview:
As a primary safety fuel-shutoff module within commercial burner trains, double gas valve bodies manage large-volume gas distribution to industrial heating equipment. The Siemens Combustion VGD20.323U Double Seat Gas Valve 1.25" NPT consists of two internal safety shutoff valve seats arranged in series within a single valve body featuring 1.25" NPT threaded connections. Designed for mounting compatible actuators in gas-fired burner control systems, this double gas valve body regulates fuel passage to commercial burners and boiler systems. By incorporating two independent safety seats inside a single cast housing, the component provides robust fuel containment, positive shut-off capabilities, and reliable flow regulation during active heating operations.

Dual-Valve Flow Control:
Fuel passage through the valve body is governed by two independently operated valve seats arranged in series along the 1.25" NPT flow path. Attached actuators respond to burner-management signals and move the internal valve stems to open both valve sections during operation. When the actuators are de-energized, the valve seats close to interrupt gas flow through the body.

Series Shut-Off Integration:
Within the burner train, the double-valve configuration provides a series shut-off arrangement controlled by the combustion management system. Active actuator signals are required to maintain the valve sections in the open position. When the control signal is removed, internal return springs close both valve seats to interrupt the fuel path and establish dual-seat shutoff.

Replacement Guidelines:
Replacement of the double gas valve body is appropriate when internal mechanical seat wear, casting damage, or internal seal degradation prevents the valve seats from achieving tight gas shut-off. For Siemens Combustion VGD20.323U, relevant conditions may include binding internal valve guides or internal seat leakage between the primary and secondary chambers. Replacing the valve body restores the burner train's mechanical integrity and dual-seat shut-off function.

Common Failure Symptoms:

  • Burner management system lockouts during pre-purge or ignition sequences.
  • Inability to achieve leak-tight shut-off across the gas train valve seats.
  • Binding or restricted travel of internal valve stems during actuator stroke.
  • Diagnostic fault codes indicating valve proving system or safety interlock failures.
  • Loss of gas pressure past the primary valve seat during system standby.

Equipment Compatibility:
The Siemens Combustion VGD20.323U Double Seat Gas Valve 1.25" NPT is used with applicable commercial burners and Siemens combustion control systems. Before purchasing, verify the equipment model and existing part number.

Technical Specifications:
Brand: Siemens Combustion
Part Number: VGD20.323U
Product Type: Double Gas Valve Body
Connection Size: 1.25" NPT

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Product Questions (7)
Customer Questions
What maintenance is required for the Siemens Combustion VGD20.323U Body Controls?

Regularly inspect the valve body for leaks, corrosion, and debris. Check connections and test valve operation. Cleaning and ensuring proper gas flow prevents performance issues and maintains safe operation.

What are common issues with the Siemens Combustion VGD20.323U Body Controls?

  • Gas leaks or improper sealing.
  • Sticking or slow valve operation.
  • Corrosion or buildup inside the valve.
  • Inconsistent pressure regulation.

How does the Siemens Combustion VGD20.323U Double Gas Valve Body control gas flow?

It provides dual-valve gas-flow control within compatible commercial burner and combustion systems, using two valve seats arranged in series to control gas passage through the fuel-delivery pathway.

How does the Siemens Combustion VGD20.323U Double Gas Valve Body work with burner controls?

It interfaces with compatible actuators and burner controls to coordinate gas passage with the equipment's operating sequence.

What types of commercial equipment can use the Siemens Combustion VGD20.323U Double Gas Valve Body?

It is used in compatible commercial boilers, furnaces, and burner systems that require controlled gas shut-off and fuel delivery.

What should be checked before selecting a Siemens Combustion VGD20.323U Double Gas Valve Body?

The equipment application, existing valve identification, gas piping connection requirements, and applicable manufacturer documentation should be checked before selection.

How should the Siemens Combustion VGD20.323U Double Gas Valve Body be maintained?

The valve body should be inspected when the equipment indicates a possible gas-flow or fuel-control issue. Specific servicing should follow the applicable manufacturer documentation.

Installation Steps

Step 1: Turn off the main gas supply and power to the appliance before starting.

Step 2: Remove the old gas valve, noting all connections.

Step 3: Attach the new valve to the gas line using a fitting.

Step 4: Connect control wiring according to manufacturer’s diagram.

Step 5: Check all connections for leaks with a soap solution.

Step 6: Restore power and gas, then test the system for proper operation.