Pulse valve model specification representation and basis
PULSE VALVE MODEL SPECIFICATION REPRESENTATION AND BASIS
1.Pulse valve specifications are defined by the inner diameter of the connecting pipe installed at its output port.
The identification of a pulse valve comprises two components: the model and the specification.
The model uses letters designated by each manufacturer, reflecting the valve’s control mode and type (e.g., right-angle valve, submerged valve).
Both industrial standards and the common practice of manufacturers at home and abroad express pulse valve specifications based on the inner diameter of the connecting pipe at the output port, in inches or millimeters.
With technological advancements in bag filters and evolving market demand, dust collectors are trending toward larger sizes and longer filter bags. This requires valves with a larger pulse-jet volume, as well as large-bore valves with appropriate dimensions and arrangements to match the row spacing of filter bags.
A few years ago, a so-called 4″ (102 mm) pulse valve appeared on the market. It had the same outline dimensions as a conventional 3″ (76 mm) submerged valve and the same 200 mm diaphragm diameter. Although this valve has been used in many applications, doubts have been raised regarding its actual pulse-jet performance.
As shown in Figure 1, the nominal 4″ (102 mm) value refers to the inner diameter of the valve output port itself, not the inner diameter of its matching connecting pipe.
Therefore, neither in terms of the specification-defining principle nor actual jet performance can it be regarded as a genuine 4″ (102 mm) pulse valve.
Based on the inner diameter of the connecting pipe at the output port, it is, at most, a 3.5″ (89 mm) pulse valve.
Figure 1, Nominal 4' (102mm) Pulse Valve Dimensions
2.Expanding the Output Caliber of the Pulse Valve and Reducing Its Overall Size Cannot Be Achieved Simultaneously
A pulse valve opens and closes through the deformation of its diaphragm, driven by pressure differences between the two air chambers on either side of the diaphragm (see Figure 3). To achieve a larger blowing air volume, it is necessary not only to increase the inner diameter of the connecting pipe at the pulse valve output, but also to enlarge the flow passage volume and opening stroke of the valve. This in turn requires the use of a larger-diameter diaphragm.
Generally, when the inner diameter of the connecting pipe at the pulse valve output is increased by 1″ (25 mm), the diaphragm diameter must be increased by approximately 30 mm. Since the diaphragm diameter determines the overall volume of the pulse valve, it is clear that expanding the output caliber of the pulse valve and reducing the valve’s physical size cannot be realized simultaneously.
