We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Bronze safety relief valve with stainless spring, 3/4 inch NPT female connections

Conbraco Industries

Conbraco Industries Apollo Valve 10-408-05 Safety Relief Valve 30 psi 3/4" NPT Female

SKU CH-VB6X-NTDDG

Bronze safety relief valve preset to 30 psi protects ASME Section IV hot water boilers up to 250 degrees F

  • TypeRelief Valves
  • Selling UnitBox
  • ASME Section IV rated for hot-water boiler safety
  • 30 psi factory-set relief pressure protects hydronic systems
  • ASTM B584 bronze body resists corrosion in heating loops
  • Stainless-steel spring maintains consistent opening force over time
  • Silicone seat seals reliably up to 250 degrees F

Safety Relief Valve for Hot Water Boilers

The Apollo Valve 10-408-05 is an ASME Section IV certified safety relief valve designed to protect hot water heating boilers and hydronic systems. It opens at a factory preset of 30 psi to discharge excess pressure automatically. The bronze body and stainless steel spring resist corrosion in continuous heating service.

3/4 Inch Female NPT Inlet Connection

This valve installs directly onto a male NPT threaded fitting using its 3/4 inch female inlet and outlet ports. The connection size determines whether the valve matches existing boiler tapping or piping without adapters. Verify the thread specification on the equipment before ordering to ensure a proper seal.

Bronze Construction With Silicone Seat

The ASTM B584 bronze body and nozzle withstand temperatures up to 250 degrees Fahrenheit for high temperature hydronic applications. A silicone seat provides tight shutoff after relief cycles while the stainless steel spring maintains consistent opening pressure. These materials extend service life in closed loop heating systems.

Highlights

  • ASME Section IV rated for hot-water boiler safety
  • 30 psi factory-set relief pressure protects hydronic systems
  • ASTM B584 bronze body resists corrosion in heating loops
  • Stainless-steel spring maintains consistent opening force over time
  • Silicone seat seals reliably up to 250 degrees F

Specifications

TypeRelief Valves
Selling UnitBox

Questions about this item

What does the 30 psi set pressure mean for my hot water heating system?

The valve will automatically open when system pressure reaches 30 psi to protect the boiler, then reseat once pressure drops below that level.

How does the 3/4 inch NPT female connection affect installation?

Both inlet and outlet use 3/4 inch female NPT threads, so you must connect them to male NPT fittings with thread sealant for a leak-free joint.

What clearances and orientation does the bronze body require for proper mounting?

Install upright with the spring chamber vertical and enough space above for the lever to lift fully; the 250 degree F temperature rating allows standard boiler piping clearances.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.