Alarm Check Valve Equivalent Length

80 nb 4 7 mtrs.

Alarm check valve equivalent length. An alarm check valve can be activated or opened in one of two basic ways. Alarm valve is a double seated clapper check valve with grooved seat design which ensures positive water flow for alarm operation. The diaphragm valve has an l e d ratio of 160. Our goal is to represent this 22 8 m equivalent length of 80 mm pipe as its equivalent in 100 mm pipe.

Meanwhile in the event of variable pressure condition false alarm is prevented with provision of retard chamber at the external bypass. Length of pipe c 120 100 nb 6 1 mtrs. The nfpa 15 standard has equivalent lengths for valves and fittings based on the type of valve or fitting and the pipe size. Equivalent length of valves and fittings calculation for pipes with a nominal diameter from 1 2 to 24 inches there is certain amount of pressure loss in straight pipe and in addition valves and fittings in a section of pipe will add to the overall pressure loss that occurs in a section of pipe.

The wet alarm valve is designed for applications where the water is unlikely to freeze. Check valve alarm screen drain restriction with 0 125 3 2 mm orifice inlet restriction with 0 219 5 6 mm orifice figure 2 model av 1 300 alarm check valve operation figure 3 restriction assembly provided with alarm check valve trim. Expressed in equivalent length of schedule 40 pipe based on hazen williams formula. This makes the equivalent length of the 80 mm section as 80 mm pipe 10 160 x 80 1000 22 8 m.

The viking model j 1 alarm check valve serves as a check valve by trapping pressurized water above the clapper and preventing reverse flow from sprinkler. It serves a dual purpose which prevents a reverse flow of water non return also provides for the use of the water motor gong. Once the alarm check valves are activated they will allow water to flow through the system engaging the sprinkler system as and where needed in order to suppress a potential fire. Alarm check valve is core element in wet pipe fire sprinkler systems.

The water staying pressurized in the pipes is released over the fire area after the sprinkler is activated. Using the equation. Terms of equivalent 150 nb 7 mtrs. Either manually when a person activates a water gong or electronically.

Systems with water working pressures above 175 psi 12 1 bar may require extra heavy. Then depending on the c value and the pipe inside diameter in relation to steel schedule 40 inside diameter there are factors to multiply the equivalent length by.