I - GUIDELINES FOR SELECTION AND INSTALLATION OF PRESSURE REDUCING VALVE 

          

            1 A pressure relief valve selection: 

            Current trend of using PPR pipe (Polypropylene Random) for water supply systems are becoming popular in high-rise buildings in our country. To install pressure reducing valve on the pipe should PPr pipe welded at both ends 2 raccord Dies as shown below: 
I - GUIDELINES FOR SELECTION AND INSTALLATION OF PRESSURE REDUCING VALVE 

          

            1 A pressure relief valve selection: 

            Current trend of using PPR pipe (Polypropylene Random) for water supply systems are becoming popular in high-rise buildings in our country. To install pressure reducing valve on the pipe should PPr pipe welded at both ends 2 raccord Dies as shown below: 

 

 

 

 

 

 

 

 

 

 

 

 

 

           

              However, customers note PPr pipe diameter and diameter threaded connection racco not the same (other than zinc pipe diameter threaded pipe the same diameter). Specifically as follows: 

REN garbage OUT 

Threaded MALE UNION 

PPr DN 20 * 1/2 "

Pipe diameter DN 20 * 15 threaded outer diameter 

PPr DN 25 * 3/4 "

Pipe diameter DN 25 * 20 threaded outer diameter 

PPr DN 32 * 1 "

Pipe diameter DN 32 * 25 threaded outer diameter 

PPr DN 40 * 1.1 / 4 "

Pipe diameter DN 40 * 32 threaded outer diameter 

PPr DN 50 * 1.1 / 2 "

Pipe diameter DN 50 * 40 threaded outer diameter 

PPr DN 63 * 2 "

Pipe diameter DN 63 * 50 threaded outer diameter 

PPr DN 75 * 2.1 / 2 "

Pipe diameter DN 75 * 65 threaded outer diameter 

PPr DN 90 * 3 "

Pipe diameter DN 90 * 80 threaded outer diameter 

PPr DN 110 * 4 "

Pipe diameter DN 110 * 100 Diameter Dies 

            So when will PPr pipe fitting pressure relief valve diameter is reduced by 1 level, for example: PPR pipe diameters DN50 (2 ") diameter threaded connections outside of racco is 40 and will be fitted with pressure relief valves DN40 (1.1 / 2 "). Therefore, to ensure adequate water flow when designers need to pay attention to this selection PPr pipe diameter accordingly. 

            

             2 A pressure reducing valve installation: 

             For high-rise buildings (from 6 floors up) the installation of pressure reducing valve will help protect the water using devices. In our country today, the design of water supply lines in buildings including system pumps water from the basement pushing up on the rooftop water tank and relies on high pressure water from the water tank on top of the building to water level axis to the bottom floor. But in today's reality, especially for apartment buildings or office buildings to the presence of cost saving should pressure reducing valve is usually installed on the shaft to the main water supply pipe and just about from 4-5 floors to install a pressure reducing valve. This installation makes the water pressure between the unstable layer. 

             Assuming a 24-storey building, if installed at floor 20, and a pressure relief valve that is just 4 floors from the 16th floor, 12, 8, 4 will install a pressure reducing valve. If just a floor 20 to ensure pressure would use to install pressure relief valves output pressure of 2 bar. The height of each floor is 3.5 meters suppose. In theory any height difference of 10 meters will generate the equivalent of 1bar pressure. When it is less than the 17th floor 20th floor is 3.5 meters x 3 = 11.5m equivalent to the pressure difference of 1.15 bar. That means the water pressure at level 17 will be 2bar + 1,15bar = 3.15 bar. With a water pressure of 17 stories higher than the 20th floor and the 16th floor outlet pressure will be 3,5bar. 

            Therefore, to ensure the water pressure in the output is the same story we need to mount the pressure relief valve at the top of each floor laterals instead of mounted on the spindle case as above. Then we can adjust the output of the pressure relief valves are pressure 2bar the entire room at the same floor and are using 2bar. 

 

                 Diagram of pressure relief valves installed at the top of each layer of branch pipe 

 

 

II - INSTALLATION INSTRUCTIONS PRESSURE REDUCING VALVE 

 

Pressure relief valve is used to reduce and stabilize the output pressure. Outlet pressure is always less than or equal to the input pressure. 

 

           Pressure relief valve allows adjustment of the output pressure approximate the desired value, as long as that value lies in the adjustment of the valve. When the valve adjustment is complete, the output pressure is almost constant despite changes in inlet pressure, of course, input pressure must be higher than the pressure in the output selected. Outlet pressure while also hardly changed over the entrance flow. 

         

          1 - Instructions for installing pressure reducing valves 

          Pressure relief valve must be installed with water in vertical direction arrow on the valve body (C). For more safety and longevity of the pressure reducing valve, we recommend fitting a filter before the pressure relief valve to remove sediment that may be in the water. If the water and sediment will affect the valve disc and make incorrect valve operation. 

 

INSTALLATION INSTRUCTIONS PRESSURE REDUCING VALVE 

 

Pressure reducing valve mode preset outlet pressure is 3 bar. In case of need to change the output settings to comply with the following guidelines: 

- Before adjusting the output pressure must close all valves, taps installed after the pressure relief valve. 

- To reduce the output pressure of the pressure relief valve, you remove the cap (A) and loosen the screw (rotate counterclockwise direction). 

- To increase the output pressure of the pressure relief valve, you remove the cap (A) and tighten the screws on (rotate clockwise direction down). 

 

Note: To help them adjust to the pressure where the easy, you should unscrew the plastic (F) on the valve body and insert a pressure gauge on it. When looking at the pressure gauge, you will be easier to adjust output pressure to the desired level.