Models 2770, 2771

Brass Resticting Disc

Function: Used to reduce water pressure at hose line by restricting flow. Brass disc with orifice size as ordered.

Model 2770 ........................... 1½"/3.8cm
Model 2771 ........................... 2½"/6.4cm

Sizing Information:

  A  = 0.0425
  A2 = Orifice Size in Squeare Inches
  Q  = Flow in GPM
  P1 = Inlet Pressure
  P2 = Required Outlet Pressure

0.0425 x GPM/lpm divided by square root of difference between inlet pressure and required 
outlet pressure results in orifice size, in square inches.