DANIEL 762 User Manual page 83

Operation parameters
Oil specifications
Use a light weight non-detergent oil between 5-30 Centipoise based on climate conditions
of user.
The oil to fill the reservoir, gas tank, pressure switch and other interconnecting pieces is to
be supplied by the customer.
Opening/Closing speed
The opening speed of the valve is virtually unrestricted. Closing speed is standard at three
(3) seconds from a full open position, based on gas pressure being 25 psi (1,724 kPa)
above line pressure. The fastest closure is limited to 0.5 seconds at 1,500 seat ring. For
closure speeds longer than three (3) seconds, the orifice size can be changed to match
customer requirements. It should be noted that the calculated closing speeds are a
function of the viscosity of the oil in the reservoir. Typical valve opening times are
illustrated in
Figure 8-1:
Pressure switch
The valve will open any time gas pressure is less than line pressure. A pressure switch is
recommended in the gas supply line to the valve for alarm actuation should gas pressure
decrease below an acceptable operating level.
82
Figure 8-1 below .
Typical valve opening time
Daniel Models 762, 763, 765, 766 and 767 Control Valves
USER MANUAL
83
www.Daniel.com