User manual DHI CONSTANT VOLUME VALVE PN 402151 INSTALLATION INSTRUCTIONS

[. . . ] Constant Volume Valve P/N 402151 Installation Instructions CONSTANT VOLUME VALVE, P/N 402151, INCLUDES: QTY 1 2 1 1 1 PART NO 402177 103686 102159 103426 560076 DESCRIPTION Valve, constant volume DH500 F x DH200-2 M adaptor 10-32 UNF M x 1/8 in. [. . . ] To close the valve, vent the drive air pressure. To reduce the opening/closing speed of the valve, put an adjustable restriction or fixed orifice on the drive air supply and exhaust. This can be useful to reduce pressure perturbations from the valve opening/closing. To automate opening and closing of the valve, use a three way, low pressure solenoid valve to control drive air/vent supply to the valve actuator. To reduce the relative effect of the small change in volume due to deformation of the valve seat after the valve closes, add volume to the pressurized system. After the valve closes, a small volume change occurs from elastic deformation of the seat. The deformation can be reduced by special shimming to reduce the force of the needle on the seat when the valve is closed, but the maximum differential pressure on port A is reduced. · INSTALLATION Connect the valve between the two pressure systems to be isolated using ports A and B. Use the DH200-2 M x DH500 F adaptors supplied if desired. [. . . ] Use the 10-32 UNF M x barb adaptor or 10-32 UNF M x quick connector supplied if desired. · · · Document 560076 050216 DH Instruments, Inc. 4765 East Beautiful Lane Phoenix AZ 85044-5318 USA Tel 602. 431. 9100 Fax 602. 431. 9559 dhi@dhinstruments. com www. dhinstruments. com [. . . ]