18: VALVES & REGULATORS EMIcorp.com
Collected Exhaust using Intermediate Modules Depending on the sizes of the cylinders and the speed required by the application, back pressures in the island may be efficiently evacuated through multiple exhaust collections using Intermediate Modules. Another method to block exhaust back pressures when they may affect the application is to isolate the valves in the island that control the largest and fastest cylinders. This is easily achieved with an intermediate module.
Blocking Exhaust Back Pressures Inside the Island Limiting Exhaust Back Pressures in a Valve Island
C cylinder, large and fast moving, may feed the island exhaust channel with an exhaust back pressure PE. Such a back pressure is normally under 14 PSI. Since the opposite pressure, P, is high, it will not affect double-acting cylinders, such as B . However, such a back pressure may affect a single-acting cylinder A if its pressure threshold is low.
Blocking Exhaust Back Pressures with 3/2 Modules
Single-Acting Cylinder Controlled by a 3/2 Valve Double-Acting Cylinders Controlled by 4/2 Valve Modules Integrated Exhaust Non-Return Valve in All Single and Double 3/2 Valve Modules Size 1
Consequently, small single-acting cylinders may pop out unexpectedly whenever an exhaust back pressure rises into the island. To avoid such malfunctions, Size 1 3/2 valve modules feature integrated exhaust non-return valves that will block any exhaust back pressure from reaching the acting cylinders they control.
Intermediate Module with the Configuration Plate Blocking the Island Exhaust Channel
In a valve island, it is important to limit exhaust back pressures to about 14 PSI maximum so that all double-acting cylinders efficiently achieve their function at 87 PSI. Exhaust Through Mufflers For applications that do not require the exhausts to be collected, a plug-in muffler into each exhaust port of the island will evacuate exhaust back pressures.
High Flow Section Low Flow Section
Exhaust Back Pressure Control
Exhaust Back Pressure PE
1036
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