Air Pressure Safety Relief Valve N10151002 is a specially designed brass valve for water heaters. Level safety valve with screw lock nut, which prevent the user from improper usage. The valve body is hot forged in one time, which provides better leakage tightness and stands for higher pressure. Each valve is set to rated pressure and 100% leakage test during production.

• Sizes: 1/2" to 1" (DN15 to DN25)

• Working pressure: 0.6 MPa to 0.9 MPa

• Working temperature: -10 to 120℃

• Standard bore design

• Sandblasted and nickel-plated

• BSP or NPT threads available

• Customized production acceptable

• Materials: CW617N, HPb57-3, C37700, DZR

Features:

• Best seller with good quality

• 100% leakage test for each valve

• Anti-blow-out stem design

• Suitable for a full range of liquids

• Easy and swift to open and close

Parts	Material
Body	Brass
Cap	N/A
Stem	Brass
Spring	Stainless steel
disc	Plastic/brass
Handle	Plastic
Handle Spin	steel

What is air pressure safety relief valve

The safety valve is a safety and protective valve, mainly used in pipelines and various pressure-bearing equipment. When the working pressure of the medium exceeds the allowable pressure value, the safety valve automatically opens to discharge the medium. As the pressure of the medium decreases, The safety valve will be closed again to prevent the danger of overpressure in the pipeline and equipment

Applications of air pressure safety relief valves

When the pressure of the container exceeds the design regulations, the safety valve will automatically open to discharge the excessive pressure in the gas reducer to prevent the container or pipeline from being damaged. When the pressure in the container drops to the normal operating pressure, it is automatically closed to avoid exhausting all the gas due to over pressure in the container, resulting in waste and production interruption.

How to select air pressure safety relief valves

1. Confirm the functions of brass safety valves

different functions and applications require different types of safety valves, for example, water heater safety valve, gas safety valve, compressor safety valve, steam safety valve, safety pressure relief valve, safety release valve.

2. Confirm the working pressure of brass safety valves

depending on pipeline pressure needs, the brass radiator valves are designed with valve wall thickness and port sizes. The brass safety valve can adjust according to the water heater requirements, from 6.0MPa to 9.0Mpa.

3. Confirm bore size of brass safety valves

There are three different types of brass safety valve:

1). Full bore brass safety valve offers no flow restriction, which means that when it is open, the liquid can flow freely through it. This is achieved by making the ball larger than the passage size, so that the hole can be the same size as the passage.

2). Standard bore brass safety valve does not have an oversized ball, and as a result, the hole is one size smaller than the passageway. This creates a small amount of flow restriction as the fluid passes through.

3). Reduced bore brass safety valve, on the other hand, has an smaller ball and an even smaller hole, which creates significant flow restriction as the fluid passes through it.

4. Confirm thread type of brass safety valves

Thread types differ from markets and applications: BSP threads for Europe and NPT threads for North America, also other metric threads, which you must confirm before buying brass safety valves.

5. Confirm material type of brass safety valves

We currently work with HPb57-3 brass radiator valves for most customers in Europe and Asia, CW617N brass radiator valves for Europe, C377700 and lead free brass for North America.

7. Confirm surface treatment of brass safety valves

Rough brass color, nickel-plating, and chrome-plating are most widely used surface treatments for brass safety valves. Plating helps to protect the radiator valves from oxygen and look shining.

8. Confirm handle type of brass safety valves

Generally three types of handle for brass safety valves: normal handle, screw lock handle, no handle.

How to install brass air pressure safety relief valve

1. Before installing brass safety valve, make sure the valve pressure conforms to water heater. The working pressure normally marked on safety valve body and water heater instructions.

2. Clean and remove any objects from the pipes (in particular bits of sealing and metal), which could obstruct and block the valves.

3. Ensure that both connecting pipes either side of the valve (upstream and downstream) are aligned (if they are not the brass safety valves may not work correctly).

4. Make sure that the two sections of the pipe (upstream and downstream) match, the brass safety valve will not absorb any gaps. Any distortions in the pipes may affect the tightness of the connection, the working of the valve and can even cause a rupture.

Chemical compositions air pressure safety relief valves

1. China/Global Market

HPb57-3, HPb58-3, HPb59-1, HPb59-3 are most common materials used for China brass safety valve, which are acceptable for most countries in the world, except for those customers have special requirements.

HPb57-3, also called China Normal brass, a variant of CW614N brass, is a local industry standard, with little Fe contents in composition, and lower costs than CW614N. It’s widely used as a standardized material in China and accepted by most global markets and customers.

HPb58-3, is a variant of CW617N brass and commonly used for brass safety valves in China local market.

HPb59-1, has less Fe, Pb and higher price costs, it’s more used for high-quality products or market, such as brass fittings for USA market.

2. European Market

CW614N and CW617N brass materials are widely used for European brass safety valves.

CW617N brass has better physical property to stand higher working pressure and temperature, more importantly the Pb percentage share is less than 2.5% and applicable for drinking water systems, good for environment and people’s health.

CW614N Brass is also popularly used because of similar compositions and lower costs, suitable for those applications without much environmental requirements.

3. USA Market

C46500 and C377700 are most widely used materials for USA brass safety valves.

As a requirement of AB1953 regulations, all the brass valve parts which contact the water shall have Pb content less than 0.25%, also called lead-free brass or no-lead brass, all the brass water valves for USA market, such as ball valves, brass gate valves, brass check valves, brass angle valves, have been compulsory to use lead free brass.

For those brass valves not for water use, such as brass radiator valves, heating valves, C377700, or China standard HPb59-1 brass materials are workable.

Surface treatments of air pressure safety relief valves

Surface treatments provide good protection to brass safety valves

Rough color is brass safety valve body sandblasted and without plating.

Electroplating (nickel-plating and chrome-plating) can enhance the corrosion resistance of brass safety valves, increase hardness, prevent abrasion, improve conductivity, smoothness, heat resistance.

How we produce air pressure safety relief valves

1. Brass raw materials are bought from local suppliers in forms of brass bars.

2. Brass bars are cut into smaller pieces with different sizes according to order requirements, heated with natural gas.

3. The heated brass bars are forged by forging machines, Out-comings are semi-finished rough brass safety valve bodies.

4. The rough brass safety valve bodies are trimmed and cut off unnecessary parts.

5. The rough brass safety valve bodies are washed with sanding machines, to clean the dirty and oils during production.

6. The rough brass bodies are machined by CNC machinery for threads and dimensions.

7. The machined brass safety valve bodies are nickel- or chrome-plated.

8. The brass valves are ready for delivery after final finished goods quality inspection.

How we pack air pressure safety relief valves

Brass safety valve packing is very important for safe transport and brand appearance.

We pack brass safety valves in small inner boxes, then put into outer cartons, finally load in wooden pallets.

It will protect the goods well and can avoid damages and wet.

We also pack as per customers' OEM designs.

How we test air pressure safety relief valves

Our test laboratory equips with various devices for brass safety valve quality inspect and control, as well as new product development.

Equipment include material spectrometer analyzer, flow rate tester, torque tester, body resistance tester, endurance tester, high-low temperature tester.

These equipment enable us to analyze brass safety valve material compositions and type tests according to related standards, ensure our brass safety valves are correctly designed and produced.

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