Comportamento de Reguladores de Pressão para Pivô Central Após Modificação Interna
2007
Lima, Sílvio Carlos Ribeiro Vieira; Frizzone, José Antônio ; | Botrel, Tarlei Arriel; | Teixeira, Marconi Batista; | Carvalho, Marco Antônio Rosa de; Gomes, Anthony Wellington Almeida
The performance curve and hysteresis of a regulating valve of pressure used in center pivots were provided from evaluations carried out in laboratory, according to ISO (1993). As the manufacturer has changed the valve body of pressure controllers, new trials were made by using the same technical procedure followed by LIMA (2001) and LIMA et al. (2003). As a result, the mentioned modification has contributed both to improve pressure regulation and to reduce hysteresis variation and a spring vibration that usually happened into the old regulator when reaching 63,3 mca inlet pressure no longer exists. All regulators tested were considered suitable in agreement with standards required from ISO (1993).
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