（配件）西门子VGD20...系列双气阀

Double gas valves for use on gas trains, consisting of 2 safety shutoff valves of class A. Suited for use in connection with gases of gas families I...III.

The double gas valve is to be combined with 2 actuators of the SKP… line (e.g. to provide the functions of 2 safety shutoff valves in series, with different types of gas pressure governor if required).

In combination with the appropriate SKP… actuators, the gas valve also serves as a:

• Shutoff valve (in connection with the SKP10...)

• Control valve with shutoff function (in connection with the SKP20..., SKP27..., SKP50... or SKP70...)

• The electrohydraulic SKP10... actuator, which is used for shutoff functions, must always be mounted on the inlet side while the actuators with integrated governor (SKP20..., SKP27..., SKP50... or SKP70...) must always be fitted on the outlet side of the valve (with a contoured disk)

• To mount the double gas valve, 2 flanges type AGA41... / AGA51... are required

• To prevent cuttings from falling inside the valve, first mount the flanges to the piping and then clean the associated parts

• Ensure that the O-rings are fitted between the flanges and the valve body

The double gas valves VGD20... are of the normally closed type and have 2 disks, one non-contoured disk on the inlet side and one contoured disk on the outlet side.

The stems are guided on both sides of the disks, thus ensuring precise alignment and tight shutoff. The closing force of the return spring is supported by the prevailing gas pressure (class A to EN 161). A strainer on the inlet side protects the valve and downstream controls against dirt. Valve body and connecting flanges are made of die-cast aluminium, the seals of nitril rubber, and the stems of stainless steel. The double gas valves feature a pilot gas connection Rp3/4". Gas valve, flanges and actuators are supplied as separate items. No special tools are required for assembly.