Facebook Pixel
Sign-Up Bonus
Get 500 Reward Points instantly when you join.
Redeem Instantly
50 points = $1 off at checkout.
Earn as You Shop
$1 spent = 1 point every time you order.
Member Perks
Unlock exclusive member-only savings and offers.

Register and Earn 500 Reward Points
Toggle Nav
Search
Toggle Nav
Join Our Loyalty Program
main product photo

Robertshaw 720-402 Natural With Lp Valve 1/2X3/4 Inch 24V

Rating:
5 5 1
1  Review Add Your Review
Special Price $132.21 Regular Price $152.05
In stock
SKU
720-402
The Robertshaw 720-402 is a 24V combination gas valve compatible with both natural gas and Liquefied Petroleum (LP) gas. It functions as the central regulator for gas flow in gas-fired furnaces and boilers. Typically measuring 12 inches long with 3/4 inch diameter connections, this valve utilizes a 24-volt electrical signal to control gas flow and features a manual shut-off option for safety. The 40°F to 175°F operating temperature range allows for functionality in most environments. This valve offers the benefit of universal compatibility with 50/60Hz electrical grids and can be converted between natural gas and LP gas use with the included conversion kit, making it a versatile replacement part for various HVAC systems. However, due to the critical nature of gas safety, it should always be installed by a qualified technician.
Add to Wish List
HVAC Controls & Electrical, Valves
Manufacturer:
https://www.partshnc.com/media/catalog/product/7/2/720-402.jpg

Specifications

  • Size: 12x3/4 Inch
  • Temperature Range (F)/(c): 40°F to 175°F
  • Weight: 2.42lbs
  • Frequency: 50/60 Hz
  • Type of Gas: Natural Or LP
  • Voltage: 24V

PRODUCT OVERVIEW:
Managing fuel flow in residential and commercial heating equipment requires dependable valve regulation for safe operation and heat delivery. The OEM Robertshaw 720-402 dual combination gas valve regulates fuel flow in natural gas or propane (LP) systems. Featuring 1/2-inch inlet and 3/4-inch outlet NPT connections with 24V actuation, this versatile component provides reliable fuel control and shutoff capabilities across compatible furnaces, boilers, and heating appliances.

FUEL REGULATION AND VALVE OPERATION:
The internal valve assembly opens and closes gas pathways in response to incoming 24V electrical signals. Internal regulation components manage line pressure to deliver steady gas output, while the convertible valve design supports setup for either natural gas or liquid propane to maintain proper combustion parameters.

REPLACEMENT GUIDELINES:
Select the 720-402 Gas Valve when replacing worn, sticking, or leaking gas control valves on compatible heating units. Before installation, shut off the main gas supply and disconnect electrical power. Verify line sizing and thread types, check that the fuel conversion setting matches your supply type, and perform a thorough leak test on all piping connections prior to firing the appliance.

Common Failure Symptoms:

  • Burner failing to ignite due to valve not opening on call for heat
  • Inability to maintain steady flame or target heating output
  • Gas odor or physical leaks around body connections or seal interfaces
  • Electrical actuation failure preventing valve response to 24V signals
  • Intermittent main burner shutdown during heating cycles

EQUIPMENT COMPATIBILITY:
Compatibility requires matching part number 720-402, 24 VAC electrical input, 1/2-inch by 3/4-inch pipe connection sizes, and natural gas or LP fuel type with original equipment manufacturer requirements. Verify compatibility using equipment model numbers and Robertshaw technical documentation prior to installation.

Technical Specifications:
Product Identification:
Brand: Robertshaw
Part Number: 720-402
Product Type: Dual Combination Gas Valve
Physical Specifications:
Inlet Size: 1/2 in. NPT
Outlet Size: 3/4 in. NPT
Operating Parameters:
Operating Voltage: 24V
Fuel Type: Natural Gas / LP (Convertible)
Valve Operation & Control:
Control Type: 24V Actuation

Reviews 1
Write Your Own Review
You're reviewing:Robertshaw 720-402 Natural With Lp Valve 1/2X3/4 Inch 24V
Your Rating
Product Questions (6)
Customer Questions
What maintenance is required for the Robertshaw 720-402 Valve?

Inspect the valve regularly for gas leaks and loose fittings. Clean external surfaces and ensure electrical connections remain tight and dry. Proper maintenance ensures safe operation and prevents performance issues in gas control systems.

What are common issues with the Robertshaw 720-402 Valve?

  • Gas leakage due to worn seals.
  • Valve sticking or failure to open/close properly.
  • Electrical coil malfunction or inconsistent response.
  • Pressure regulation instability.
  • Incorrect wiring causing intermittent operation.
  • Slow response due to contamination buildup.

What is the primary function of the Robertshaw 720-402 valve?

The valve regulates and controls fuel gas flow to heating system burners in response to incoming 24V control signals.

How does fuel conversion work on this model?

The valve includes convertible regulation components that allow field adjustment for operation with either natural gas or LP.

What gas fuel types does this valve support?

This valve is designed for natural gas systems and includes capability for liquid propane (LP) conversion.

What pipe connection sizes are featured on this valve?

The valve features a 1/2-inch NPT inlet connection and a 3/4-inch NPT outlet connection.

Installation Steps

Step 1: Turn off gas supply and disconnect power before starting.

Step 2: Remove the old valve and clean the pipe threads.

Step 3: Apply thread sealant and connect the new valve securely.

Step 4: Attach wiring following the configuration diagram.

Step 5: Turn on gas, check for leaks, and restore power.