Apollo RVS14 Relief Valves

Apollo RVS14 relief valves are 100% American Made bronze high-capacity low-pressure safety relief valves from the Apollo 14 Series, designed for overpressure protection of steam boilers, low-pressure high-volume blowers, compressors, and vacuum systems. Apollo RVS14 relief valves are capacity certified by the National Board at 15 psig only, in accordance with ASME Boiler and Pressure Vessel Code Section IV, and are registered in all Canadian provinces and territories under CRN No. 0G8547.5C. The RVS14 series covers three connection sizes at SupplyHouse: 2" MNPT x 2" FNPT (SKU 1420508), 2-1/2" MNPT x 2-1/2" FNPT, and 3" MNPT x 3" FNPT (SKU 1420708), with BTU capacities ranging from 3,150 BTU at the 2" size to 6,843 BTU at the 3" size. All three sizes feature a one-piece body, all-bronze construction, a set pressure of 15 psig, and a maximum operating temperature of 250°F. For any steam boiler, commercial blower, compressor, or vacuum system requiring National Board capacity-certified overpressure protection at 15 psig, the Apollo RVS14 is the engineered specification. A test gag option is available across the lineup to prevent the valve from opening during hydrostatic testing of the boiler.

KEY SUBCATEGORIES / PRODUCT TYPES

Apollo RVS14 2" MNPT x 2" FNPT (SKU 1420508)

The Apollo 1420508 is a 2" MNPT x 2" FNPT RVS14 High Capacity Low Pressure Steam Safety Valve rated at 15 psi with a BTU capacity of 3,150 BTU. The 1420508 is the smallest connection size in the Apollo RVS14 lineup at SupplyHouse and serves medium and large commercial and industrial steam heating boilers in the applicable BTU capacity range. The body material is ASTM B584-C84400 bronze. The seat material is EPDM with PTFE coating for positive seal, high temperature resistance, and positive drainage of condensate from the seat area. The spring material is stainless steel. The valve includes a 3/8" NPT side tapping for drain connection. The body and nozzle are brass. The valve carries ASME Section IV certification with HV stamp, National Board capacity certification at 15 psig, Made in USA designation, and compliance with the Build America Buy America (BABA) Act and Buy American Act (BAA). Maximum operating temperature is 250°F (121°C). A test gag variant that prevents the valve from opening during hydrostatic testing is available by adding "G" to the suffix.

Apollo RVS14 2-1/2" MNPT x 2-1/2" FNPT with Test Gag

The Apollo 2-1/2" MNPT x 2-1/2" FNPT RVS14 High Capacity Low Pressure Safety Valve is rated at 15 psi with a BTU capacity of 4,676 BTU, occupying the mid-range capacity position between the 2" and 3" models in the Apollo RVS14 lineup at SupplyHouse. The stocked configuration of this model at SupplyHouse includes the test gag option, which prevents the valve from lifting during hydrostatic pressure testing of the boiler or system it protects. The 2-1/2" size serves larger commercial and industrial steam boiler applications where the 2" connection's 3,150 BTU capacity falls short of the boiler's required relief capacity and the 3" connection isn't warranted. All RVS14 construction features, ASTM B584 bronze body, EPDM seat, stainless steel spring, 3/8" NPT drain tapping, National Board capacity certification at 15 psig, and ASME Section IV compliance, apply to the 2-1/2" model.

Apollo RVS14 3" MNPT x 3" FNPT (SKU 1420708)

The Apollo 1420708 is a 3" MNPT x 3" FNPT RVS14 High Capacity Low Pressure Safety Valve rated at 15 psi with a BTU capacity of 6,843 BTU, the largest and highest-capacity model in the Apollo RVS14 lineup at SupplyHouse. The 1420708 serves large commercial and industrial steam heating boiler applications where the boiler's maximum output demands the highest capacity steam safety relief valve in the RVS14 series. The 3" size carries the same ASME Section IV National Board certification at 15 psig, ASTM B584 bronze construction, EPDM seat with PTFE coating, stainless steel spring, 3/8" NPT side tapping for drain connection, and 250°F maximum operating temperature as the 2" and 2-1/2" models. A test gag variant is available by adding "G" to the suffix. Height of the 3" model is 9.37".

BUYING GUIDE / HOW TO CHOOSE

Selecting the right Apollo RVS14 relief valve starts with confirming the BTU input rating of the steam boiler or system being protected. The RVS14 is ASME Section IV capacity certified at 15 psig only, and the specific BTU capacity of each valve must equal or exceed the maximum BTU input of the boiler it's protecting. The 2" RVS14 (SKU 1420508) carries a 3,150 BTU capacity. The 2-1/2" RVS14 carries 4,676 BTU. The 3" RVS14 (SKU 1420708) carries 6,843 BTU. Undersizing a safety relief valve for a boiler's BTU input means the valve can't relieve pressure fast enough if controls fail, which is a code compliance and safety issue, not just a performance one.

The connection size on the boiler's safety valve tapping determines which RVS14 fits the installation. All three RVS14 models use male NPT inlet connections and female NPT outlet connections, matching the threaded tapping configuration standard on commercial steam boilers. The connection size at the boiler's safety valve port must be confirmed before ordering. Installing a valve with a different connection size requires an adapter and may not comply with the original equipment manufacturer's specifications or the authority having jurisdiction's requirements.

The set pressure on all Apollo RVS14 models is fixed at 15 psig. The RVS14 series is not adjustable and is not rated for applications above 15 psig. For steam boiler applications requiring a different set pressure or for hot water boiler relief applications, other Apollo series, including the RVW10, RVW40, and RVW60, cover those applications at different set pressures and configurations.

The test gag option is worth specifying on new boiler installations or any project that includes hydrostatic pressure testing of the steam system before startup. The test gag prevents the valve from lifting during the test pressure cycle, protecting the seat and disc from premature wear or contamination. The 2-1/2" RVS14 model at SupplyHouse is stocked with the test gag included. For the 2" and 3" models, the test gag variant is specified by adding "G" to the part number suffix.

All Apollo RVS14 valves comply with the Build America Buy America (BABA) Act and the Buy American Act (BAA), making them the correct specification for publicly funded projects with domestic content requirements.

FAQs

What is the Apollo RVS14 relief valve and what applications does it serve?

The Apollo RVS14 is a 100% American Made bronze high-capacity low-pressure safety relief valve in the Apollo 14 Series, designed for overpressure protection of steam boilers, low-pressure high-volume blowers, compressors, and vacuum systems. Apollo RVS14 relief valves are capacity certified by the National Board at 15 psig only, in accordance with ASME Boiler and Pressure Vessel Code Section IV, and are registered in all Canadian provinces and territories under CRN No. 0G8547.5C. The RVS14 series is available in 2", 2-1/2", and 3" connection sizes, covering BTU capacities from 3,150 BTU through 6,843 BTU at the 15 psig set pressure.

What are the BTU capacities and connection sizes available in the Apollo RVS14 lineup at SupplyHouse?

Apollo RVS14 relief valves at SupplyHouse are available in three connection sizes and BTU capacities: the 2" MNPT x 2" FNPT model (SKU 1420508) at 3,150 BTU, the 2-1/2" MNPT x 2-1/2" FNPT model at 4,676 BTU (stocked with test gag), and the 3" MNPT x 3" FNPT model (SKU 1420708) at 6,843 BTU. All three models are set at 15 psig and carry a maximum operating temperature of 250°F. Selecting the correct BTU capacity requires confirming that the valve's rated BTU capacity meets or exceeds the maximum BTU input of the boiler or equipment being protected.

What materials are used in Apollo RVS14 relief valve construction?

Apollo RVS14 relief valves are constructed with an ASTM B584-C84400 bronze one-piece body and brass body and nozzle. The seat material is EPDM with PTFE coating, providing positive seal, resistance to high operating temperatures, and positive drainage of condensate from the seat area. The spring is stainless steel. All RVS14 valves include a 3/8" NPT side tapping for drain connection. The 2" model (SKU 1420508) weighs 8.4 lbs per Apollo's official product documentation.

What is the test gag option on Apollo RVS14 relief valves and when should it be specified?

A test gag on an Apollo RVS14 relief valve is a device that prevents the valve from lifting during hydrostatic pressure testing of the steam boiler system, protecting the valve seat and disc from premature wear or contamination caused by the test pressure cycle. The 2-1/2" RVS14 model at SupplyHouse is stocked with the test gag included. For the 2" (SKU 1420508) and 3" (SKU 1420708) models, the test gag variant is specified by adding "G" to the part number suffix. Specifying a test gag is recommended on new boiler installations and any project that includes hydrostatic pressure testing before the system is placed in service.

What ASME and certification standards do Apollo RVS14 relief valves carry, and do they qualify for public projects?

Apollo RVS14 relief valves carry ASME Section IV certification with HV stamp, National Board capacity certification at 15 psig only, and registration in all Canadian provinces and territories under CRN No. 0G8547.5C. All RVS14 models carry the Made in USA designation and comply with both the Build America Buy America (BABA) Act and the Buy American Act (BAA), making them the correct specification for publicly funded projects with domestic content requirements. The ASME Section IV certification applies to heating boilers specifically, and the RVS14 is not rated or certified for applications requiring ASME Section VIII or other code designations.