Apollo Valve 10-400 Series Bronze Safety Relief Valve - ASME 50 psi

In this review the Apollo Valve 10-400 series safety relief valve is assessed for hydronic heating and hot water boiler use; the bottom line is that it is a simple, reliable pressure relief solution for systems that require an ASME Section IV rating and a 50 psi set pressure. The reviewer found the bronze construction, silicone seat and stainless steel spring combine to deliver corrosion resistance and stable operation up to 250 degrees F, making it suitable for residential and light commercial water heating systems where consistent pressure protection is the priority.

Key Features

• Preset 50 psi relief: The 50 psi set pressure provides defined, reliable pressure relief for hot water heating systems to protect equipment and piping.
• 3/4 in NPT connections: The 3/4 in male inlet and 3/4 in female outlet thread pattern simplifies replacement on common plumbing and boiler fittings.
• Bronze body and nozzle: ASTM B584 bronze construction resists corrosion in hot water environments and maintains dimensional stability over time.
• Silicone seat: The silicone seat tolerates higher operating temperatures and helps ensure a tight reseal after discharge.
• Stainless steel spring: Stainless spring material resists corrosion and preserves consistent lift and reseating characteristics.
• ASME safety rated: Certification for Section IV makes it appropriate for hot water heating boilers and hydronic systems requiring code-compliant relief protection.

Who It's For

This valve is aimed at plumbers, mechanical contractors and DIYers replacing or specifying a safety relief valve on residential or light commercial hot water boilers and hydronic heating systems that require an ASME Section IV rated device and a 50 psi set pressure. The straightforward 3/4 in NPT threads and bronze construction make it a practical choice when corrosion resistance and code compliance are needed.

Customers who need adjustable set pressures, gas service compatibility, or ratings above 250 degrees F should look elsewhere, since this unit is a fixed 50 psi relief valve designed specifically for hot water applications up to 250 degrees F.

Pros & Cons

Pros

• Bronze body and nozzle provide good corrosion resistance for water heating systems.
• ASME Section IV safety rating ensures code acceptance for many boiler and hydronic installs.
• Silicone seat and stainless spring support reliable reseating and long-term thermal resistance to 250 degrees F.

Cons

• Fixed 50 psi set pressure limits use to systems that require that specific relief point rather than adjustable options.

Specifications

Our Verdict

The Apollo Valve 10-400 series is a solid, no-frills safety relief valve for hot water boilers and hydronic systems that need a reliable, ASME-rated 50 psi protector. Its bronze construction, silicone seat and stainless spring make it durable for typical heating temperatures up to 250 degrees F, offering good value for anyone replacing a like-for-like relief valve or specifying a compliant safety device.

Frequently Asked Questions

Is this valve suitable for boilers?
Yes, it is ASME safety rated for Section IV hot water heating boilers and hydronic systems.

Can the set pressure be adjusted?
No, this model has a preset relief pressure of 50 psi and is not designed for field adjustment.

What fluids and temperatures is it rated for?
It is intended for hot water applications and is rated for operating temperatures up to 250 degrees F.