Brass Safety Valves

Brass Safety Valve Manufacturer in China
 
As one of the most professional water heater safety valve producers and pressure reducing valve manufacturers in China, we have been doing every effort to design and produce brass safety valves with stable and reliable quality, each valve is manually set with rating pressure and leakage test, Products include brass boiler safety valve, electric heater safety valve, pressure reducing valves, air vents.

Reference details of water heater safety valve

There must be a water heater safety valve installed on the water pipe of the electric water heater. Although the water heater safety valve is small in size, it plays a big role. It has the functions of preventing backflow, safe pressure relief, drainage and cleaning, and is a device to ensure the safe operation of the electric water heater. . Let's introduce the safety valve of electric water heater in detail below.
What is a water heater safety valve

1. What is a water heater safety valve

The water heater safety valve is a multifunctional storage type electric water heater safety relief valve, suitable for electric water heaters, air energy water heaters, and has check valve and pressure relief valve functions at the same time, which can prevent the water entering the electric water heater from flowing back and in the electric water heater. When the pressure of the inner tank is high, the excess pressure is discharged to ensure the life of the inner tank and avoid accidents of bladder explosion.
The water heater safety valve is also called the pressure relief valve. According to its literal meaning, we can know that when the pressure inside the water heater is too high, the water heater safety valve can be activated to adjust the internal pressure. If the pressure is too high, it can release a part of the pressure and make the water heater in a safe working state. When the water heater is heated, water will splash out, but as long as the water pressure is normal, it will not splash or flow out. Moreover, with the safety valve of the water heater, it can also ensure that the water in the water heater is in a full state, so as to prevent the occurrence of empty burning.

2. Specifications of water heater safety valve

Size: 1/2″
Material: Brass
Water inlet pressure (opening pressure): ≤0.1MPa
Flow rate: 0.28L/S under 0.03Mpa water pressure
External relief pressure: pressure relief>0.7mpa stop leakage
Internal relief  pressure: pressure relief>0.31mpa stop leakage
When in the state of external pressure relief, the water output per minute >11 drops
Safe relief pressure≤0.7MPa

3. Structure of water heater safety valve

The water heater safety valve is usually made of brass, which has good safety and thermal conductivity. Nickel-plated surface treatment can effectively prevent corrosion and oxidation resistance, making the water heater safety valve more durable.
The water heater safety valve has a three-way valve body, which is divided into a water inlet cavity, a water outlet cavity and a safety cavity. The safety cavity is provided with a drainage hole. A check valve core, an external adjustment spring, and an adjustment limit piece are placed in the outlet cavity. Place elastic cushions, safety valve cores, drain rods, and safety pressure adjustment springs in the safety cavity. The adjustment cover is screwed into the safety cavity through the drain rod. There is a protective cover outside, and a drain ear is connected to the end of the drain rod for the drain ear. The protective buckle is fastened, and the protective buckle is fixed on the drain hole seat with a drain pipe joint. It has the functions of preventing backflow, safe pressure relief, drainage and cleaning, etc., and it is easy to adjust. The safety valve should be installed vertically and installed at the gas phase interface of the container or pipeline.
Structure of water heater safety valve

4. Function of water heater safety valve

1. Relieve the pressure, the pressure of the water storage bucket will increase when the water is heated. If the temperature controller fails, the pressure will become higher and higher, which will cause the water storage bucket to burst, and the water heater safety valve will automatically open when the pressure reaches a certain value. Relieve pressure and ensure safety.

2. Check valve function. The water heater safety valve is still a check valve. The check valve will be opened by the water pressure of the water inlet pipe when the water enters. When heating, the hot water will flow back into the water supply pipe due to the increase in pressure in the barrel. Prevent hot water from flowing back.

3. Drain, because the water heater barrel is usually full of water, the water outlet is in the upper part of the barrel, and the water cannot be drained when opening the drain port. When the power supply is cut off, the water supply valve can be closed and the safety valve can be opened. The water inside came out.

5. How water heater safety valve works

The safety valve of the water heater is a safety device to prevent the pressure equipment and the container from bursting due to the pressure rise or the internal pressure of the container exceeds the limit, and to ensure the safe operation of the pressure system. When the pressure of the container exceeds the design regulations, the safety valve of the water heater is automatically opened, and the exhaust gas reduces the overpressure in the device 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 gas due to overpressure in the container, resulting in waste and production interruption.
How water heater safety valve works

6. How to install water heater safety valve

The safety valve must be installed on the water inlet. The pressure value and usage method of the safety valve of different brands and models of water heaters may be different. Please refer to the instructions for use to avoid danger due to improper use.

1. When installing the safety valve of the water heater, we can use an arrow on it to represent the direction of adding water, and we must pay attention to the safety valve of the water heater cannot be installed reversely. One end of the safety valve is generally used to connect the water tank of the water heater, and the lower end is used to connect the cold and hot water valve.

2. Use a wrench to remove the screws on the top first, and then screw up the safety valve of the water heater in the direction of the arrow. Be sure to tighten it carefully and never loosen it.

3. When using the water heater, check the safety valve of the water heater regularly to see if there is any blockage.

4. Generally speaking, the safety valve of the water heater is in a closed state, and only when the pressure of the inner tank is too high, it will automatically open.
How to install water heater safety valve

7. Precautions for the use of water heater safety valve

1. When the pressure in the water heater is not balanced, water will splash out. At this time, the socket should be installed with waterproof measures, and it should be kept away from the power switch.

2. There must be a separate socket, and it must be grounded. If there is no grounding wire, there will be a certain safety hazard. Once an electric shock accident occurs, it will cause immeasurable consequences.

3. When installing the water heater safety valve, be sure to follow its signs, and it must not be reversed, otherwise it will have no effect. If you don’t know how to install it, you can ask professional staff to install it, and be careful not to operate it with power.

8. Inspection and testing of water heater safety valve

Water heater safety valve shell strength
Connect the safety valve shell of the water heater to the test bench, close the ports of each channel, inject water to exhaust and pressurize, and after the specified holding time, check that the shell should be free of permanent deformation and leakage.

The opening pressure inside the safety valve of the water heater
Connect the outlet of the safety valve of the water heater to the test bench, the inlet is closed, and the pressure is slowly increased. When the pressure relief port drips, the pressure gauge reading value is the internal discharge pressure.

Water heater safety valve leakage pressure
Connect the outlet of the safety valve of the water heater to the test bench, the inlet is closed, and the pressure is slowly increased. When the pressure relief port drips, the pressure gauge reading value is the leakage pressure.

Water heater safety valve opening pressure
Connect the inlet of the safety valve of the water heater to the test bench, and slowly increase the pressure. When the outlet drips, the pressure gauge reading value is the opening pressure

Water heater safety valve sealing performance
Take the safety valve of the water heater with qualified opening pressure test, close the pressure relief port and inlet, and pass in the specified water pressure. After maintaining the pressure for 3s to 5s, check that there should be no leakage at the tie rods and various parts of the valve body.

Water heater safety valve flow test
Connect the safety valve of the water heater to the water supply pipeline according to the state of use, enter the water from the inlet, and determine the flow rate to meet the requirements.

Reverse sealing performance
Place the safety valve of the water heater with the inlet facing down on the test bench, and fill with water in the direction of the outlet. The inner cavity of the shell is filled with water. Observe the inlet, and it should meet the requirements.
Service life
The test conditions are specified in the following table
How to test water heater safety valve

9. Marking, packaging and storage of water heater safety valve

The safety valve shell of the water heater should have a clear and hard-to-change manufacturer's mark.
The electric water heater safety valve should be packaged to avoid friction and collision.
The water heater safety valve should be stored in a dry, non-corrosive gas interference warehouse.
The electric water heater safety valve should be transported to avoid collisions, and it should not be corroded by rain or snow during transportation.

10. The reason and solution for water heater safety valve leakage

The water heater safety valve plays a role of one-way water inlet and overpressure safety protection. Therefore, the main reason for water heater safety valve leakage is that the tap water pressure is too high. It is the safety valve that protects the electric water heater itself. How to repair the water heater safety valve leakage and how to deal with the water leakage as soon as the water heater is heated.

1. The reason why the water heater leaks as soon as it is heated

The water pressure of the tap water pipe is too high. When the pressure of the tap water suddenly increases or the inner tank is overheated due to overheating, the water heater safety valve will automatically leak and release the pressure, so that the inner tank will not be damaged due to the excessive pressure. Therefore, it is normal for the water heater safety valve to drip slowly during the heating process, and it is not a quality problem of the water heater. This also reminds users that when using the water heater, the water inlet pressure should not be too high, so as not to cause serious dripping of the safety valve. 

Treatment method: Close the water inlet valve and turn the mixing valve knob to a high temperature to open it to avoid water leakage from the water heater safety valve and make water drip out of the shower; if the water mixing valve is not installed, hot water can be discharged. Open the valve a bit to relieve the pressure, which can also avoid the leakage of thewater heater safety valve. Finally, if the dripping phenomenon of the water heater safety valve cannot be controlled, it is recommended to install a pressure reducing valve before the water heater safety valve; this is a normal phenomenon and does not require maintenance.

2. Drops of water drip out from the safety valve during the heating process of the water heater

Because the electric water heater is a closed storage type electric water heater, the water pressure in the inner tank of the water heater is greater than 6Mpa during the heating or heat preservation process, causing the water heater safety valve to overflow and drip water. Therefore, during the heating process of the water heater, drops of water dripping out of the safety valve hole are normal, and no maintenance is required. Because when the machine is heated, the water expands by heating, and the volume becomes larger, but the inner tank capacity does not change, so the pressure becomes larger. At this time, the water heater safety valve detects that the pressure becomes larger and automatically starts to release the water and pressure, so we can see The dripping phenomenon. The user can not adjust or block the pressure relief hole of the safety valve at will, and can connect a plastic hose to lead the drip to the floor drain.

3. The water heater safety valve leaks obviously

The pressure of the water heater safety valve itself is too low. The reason for the water leakage is the same as the reason 1. It is a manifestation of the water heater safety valve's automatic pressure relief. However, because the pressure of the safety valve itself is low, the water leakage will be more obvious. If you are particularly concerned, you can replace a safety valve. .

4. The reason why the indicator light of the water heater keeps on is that the temperature sensing surface of the thermostat has few contact points with the flange surface of the electric heating pipe.

5. Water heater use time is short

The reason for the short use time of the water heater is that the water heater is used for the first time (or the water heater has not been used for a period of time). Due to the short heating time of the water heater and the uneven water temperature of the upper and lower layers, the amount of hot water output is small. Treatment method: Chongqing water heater repair recommendations, continuous Use the water heater to work for more than 12 hours to make the water temperature in the water heater even up and down.

The water leakage of the water heater safety valve during use is normal. If the water leakage is not too serious, we can ignore it.

3. Structure of water heater safety valve

The water heater safety valve is usually made of brass, which has good safety and thermal conductivity. Nickel-plated surface treatment can effectively prevent corrosion and oxidation resistance, making the water heater safety valve more durable.
The water heater safety valve has a three-way valve body, which is divided into a water inlet cavity, a water outlet cavity and a safety cavity. The safety cavity is provided with a drainage hole. A check valve core, an external adjustment spring, and an adjustment limit piece are placed in the outlet cavity. Place elastic cushions, safety valve cores, drain rods, and safety pressure adjustment springs in the safety cavity. The adjustment cover is screwed into the safety cavity through the drain rod. There is a protective cover outside, and a drain ear is connected to the end of the drain rod for the drain ear. The protective buckle is fastened, and the protective buckle is fixed on the drain hole seat with a drain pipe joint. It has the functions of preventing backflow, safe pressure relief, drainage and cleaning, etc., and it is easy to adjust. The safety valve should be installed vertically and installed at the gas phase interface of the container or pipeline.
Structure of water heater safety valve

4. Function of water heater safety valve

1. Relieve the pressure, the pressure of the water storage bucket will increase when the water is heated. If the temperature controller fails, the pressure will become higher and higher, which will cause the water storage bucket to burst, and the water heater safety valve will automatically open when the pressure reaches a certain value. Relieve pressure and ensure safety.

2. Check valve function. The water heater safety valve is still a check valve. The check valve will be opened by the water pressure of the water inlet pipe when the water enters. When heating, the hot water will flow back into the water supply pipe due to the increase in pressure in the barrel. Prevent hot water from flowing back.

3. Drain, because the water heater barrel is usually full of water, the water outlet is in the upper part of the barrel, and the water cannot be drained when opening the drain port. When the power supply is cut off, the water supply valve can be closed and the safety valve can be opened. The water inside came out.

5. How water heater safety valve works

The safety valve of the water heater is a safety device to prevent the pressure equipment and the container from bursting due to the pressure rise or the internal pressure of the container exceeds the limit, and to ensure the safe operation of the pressure system. When the pressure of the container exceeds the design regulations, the safety valve of the water heater is automatically opened, and the exhaust gas reduces the overpressure in the device 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 gas due to overpressure in the container, resulting in waste and production interruption.
How water heater safety valve works

6. How to install water heater safety valve

The safety valve must be installed on the water inlet. The pressure value and usage method of the safety valve of different brands and models of water heaters may be different. Please refer to the instructions for use to avoid danger due to improper use.

1. When installing the safety valve of the water heater, we can use an arrow on it to represent the direction of adding water, and we must pay attention to the safety valve of the water heater cannot be installed reversely. One end of the safety valve is generally used to connect the water tank of the water heater, and the lower end is used to connect the cold and hot water valve.

2. Use a wrench to remove the screws on the top first, and then screw up the safety valve of the water heater in the direction of the arrow. Be sure to tighten it carefully and never loosen it.

3. When using the water heater, check the safety valve of the water heater regularly to see if there is any blockage.

4. Generally speaking, the safety valve of the water heater is in a closed state, and only when the pressure of the inner tank is too high, it will automatically open.
How to install water heater safety valve

7. Precautions for the use of water heater safety valve

1. When the pressure in the water heater is not balanced, water will splash out. At this time, the socket should be installed with waterproof measures, and it should be kept away from the power switch.

2. There must be a separate socket, and it must be grounded. If there is no grounding wire, there will be a certain safety hazard. Once an electric shock accident occurs, it will cause immeasurable consequences.

3. When installing the water heater safety valve, be sure to follow its signs, and it must not be reversed, otherwise it will have no effect. If you don’t know how to install it, you can ask professional staff to install it, and be careful not to operate it with power.

8. Inspection and testing of water heater safety valve

Water heater safety valve shell strength
Connect the safety valve shell of the water heater to the test bench, close the ports of each channel, inject water to exhaust and pressurize, and after the specified holding time, check that the shell should be free of permanent deformation and leakage.

The opening pressure inside the safety valve of the water heater
Connect the outlet of the safety valve of the water heater to the test bench, the inlet is closed, and the pressure is slowly increased. When the pressure relief port drips, the pressure gauge reading value is the internal discharge pressure.

Water heater safety valve leakage pressure
Connect the outlet of the safety valve of the water heater to the test bench, the inlet is closed, and the pressure is slowly increased. When the pressure relief port drips, the pressure gauge reading value is the leakage pressure.

Water heater safety valve opening pressure
Connect the inlet of the safety valve of the water heater to the test bench, and slowly increase the pressure. When the outlet drips, the pressure gauge reading value is the opening pressure

Water heater safety valve sealing performance
Take the safety valve of the water heater with qualified opening pressure test, close the pressure relief port and inlet, and pass in the specified water pressure. After maintaining the pressure for 3s to 5s, check that there should be no leakage at the tie rods and various parts of the valve body.

Water heater safety valve flow test
Connect the safety valve of the water heater to the water supply pipeline according to the state of use, enter the water from the inlet, and determine the flow rate to meet the requirements.

Reverse sealing performance
Place the safety valve of the water heater with the inlet facing down on the test bench, and fill with water in the direction of the outlet. The inner cavity of the shell is filled with water. Observe the inlet, and it should meet the requirements.
Service life
The test conditions are specified in the following table
How to test water heater safety valve

9. Marking, packaging and storage of water heater safety valve

The safety valve shell of the water heater should have a clear and hard-to-change manufacturer's mark.
The electric water heater safety valve should be packaged to avoid friction and collision.
The water heater safety valve should be stored in a dry, non-corrosive gas interference warehouse.
The electric water heater safety valve should be transported to avoid collisions, and it should not be corroded by rain or snow during transportation.

10. The reason and solution for water heater safety valve leakage

The water heater safety valve plays a role of one-way water inlet and overpressure safety protection. Therefore, the main reason for water heater safety valve leakage is that the tap water pressure is too high. It is the safety valve that protects the electric water heater itself. How to repair the water heater safety valve leakage and how to deal with the water leakage as soon as the water heater is heated.

1. The reason why the water heater leaks as soon as it is heated

The water pressure of the tap water pipe is too high. When the pressure of the tap water suddenly increases or the inner tank is overheated due to overheating, the water heater safety valve will automatically leak and release the pressure, so that the inner tank will not be damaged due to the excessive pressure. Therefore, it is normal for the water heater safety valve to drip slowly during the heating process, and it is not a quality problem of the water heater. This also reminds users that when using the water heater, the water inlet pressure should not be too high, so as not to cause serious dripping of the safety valve. 

Treatment method: Close the water inlet valve and turn the mixing valve knob to a high temperature to open it to avoid water leakage from the water heater safety valve and make water drip out of the shower; if the water mixing valve is not installed, hot water can be discharged. Open the valve a bit to relieve the pressure, which can also avoid the leakage of thewater heater safety valve. Finally, if the dripping phenomenon of the water heater safety valve cannot be controlled, it is recommended to install a pressure reducing valve before the water heater safety valve; this is a normal phenomenon and does not require maintenance.

2. Drops of water drip out from the safety valve during the heating process of the water heater

Because the electric water heater is a closed storage type electric water heater, the water pressure in the inner tank of the water heater is greater than 6Mpa during the heating or heat preservation process, causing the water heater safety valve to overflow and drip water. Therefore, during the heating process of the water heater, drops of water dripping out of the safety valve hole are normal, and no maintenance is required. Because when the machine is heated, the water expands by heating, and the volume becomes larger, but the inner tank capacity does not change, so the pressure becomes larger. At this time, the water heater safety valve detects that the pressure becomes larger and automatically starts to release the water and pressure, so we can see The dripping phenomenon. The user can not adjust or block the pressure relief hole of the safety valve at will, and can connect a plastic hose to lead the drip to the floor drain.

3. The water heater safety valve leaks obviously

The pressure of the water heater safety valve itself is too low. The reason for the water leakage is the same as the reason 1. It is a manifestation of the water heater safety valve's automatic pressure relief. However, because the pressure of the safety valve itself is low, the water leakage will be more obvious. If you are particularly concerned, you can replace a safety valve. .

4. The reason why the indicator light of the water heater keeps on is that the temperature sensing surface of the thermostat has few contact points with the flange surface of the electric heating pipe.

5. Water heater use time is short

The reason for the short use time of the water heater is that the water heater is used for the first time (or the water heater has not been used for a period of time). Due to the short heating time of the water heater and the uneven water temperature of the upper and lower layers, the amount of hot water output is small. Treatment method: Chongqing water heater repair recommendations, continuous Use the water heater to work for more than 12 hours to make the water temperature in the water heater even up and down.

The water leakage of the water heater safety valve during use is normal. If the water leakage is not too serious, we can ignore it.
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