The two-step valve is as standard supplied with a throttled opening of theoretically 2 mm for 38, 51 and 63.5 mm valves and 3 mm for the 76 and 101.6 mm valves. This opening can by means of the spacers be adjusted in steps of 1.5 mm up to max. 12 mm and 16 mm respectively.The valve is used for automatic twostep closing e.g. in connection with filling of a vessel where an exact volume is required. Ordering Please state "Two-Step" in the valve specification. Stronger Springs All standard actuators for SRC and ARC valves can be fitted with special springs about 35% stronger. Consequently the valves will withstand higher pressures against the valve plugs when closed by the springs.
For details of pressures etc. please see PD 65414 for SRC valves and instruction IM 70727 for ARC valves
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