VGD40
The double gas valves VGD40... are double seat disk valves of the normally closed type. The stems
are guided on both sides of the disks, thus ensuring a precise stroke and tight shutoff. To improve
the control performance, the disks at the bottom are pro-filed.
The patented double seats are closed by 2 springs. The high closing force of the return spring is
supported by the prevailing gas pressure (class «A» to EN 161). The spring of each stem exerts a
pressure on the disk so that there is a
defined closing force acting on each disk.
The surface area proportions of the 2 valve
disks per stem
are such that the closing force increases as
the inlet pressure increases (class «A» valve
to EN 161). A strainer on the inlet side
protects the valve and downstream controls
against dirt. The 4 screws required to fit the
SKP... to the valve are contained in the
terminal compartment. The double gas
valves DN40…150 correspond to the
standard valve sizes of single valves (EN
558).
The VGD40... are supplied with a pilot gas
flange having a ¾“ connection for the pilot
gas line and a ¼“ connection for an impulse line. This impulse line connection between the 2 valves
and another impulse line connection on the outlet flange can be connected directly to the constant
pressure governor SKP20... fitted to «V1» or «V2».
A universal mounting plate facilitates attachment of a number of commercially available pressure
switches or valves proving devices. Both the pilot gas flange and the universal mounting plate are
exchangeable and can be fitted on either side of the valve.
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