The CL31 regulator can produce substantial savings for users in lower
initial costs, lower installation costs and lower maintenance costs.
Optimum valve design limits over boosting or rapid drop-off as the
capacity requirement changes, including fast on-off loads.
The CL31 was designed for systems requiring highly accurate pressure
regulation such as: utility Fixed Factor metering of relatively small
loads (up to 4000scfh)and industrial heating equipment requiring
constant high burner pressures (1 PSIG to 20 PSIG).
ROOTS-CL31-REGULATOR [PDF]