Silian Technical Import & Export Co., Ltd.Chongqing

Model Number: ZZVP/N-#4494 Brand Name: ZZVP/N Key Specifications/Special Features: Self-operated pressure difference regulatorZZVP/N self-operated pressure difference regulatoris one kind of energy-saving control valve which it canadjust according to medium pressure.It is applicable for continuously controlling toburning system, generator and shaft seal system of aircompressor (P1≤0.1Mpa, P2＜10kpa). It can set the valuein running and feature no packing and adaptable. Inspectthe slight variation. It is widely used in automatic controlof micro pressure in industry producing. Use thesecondary pressure reduction when the reduction ratio ismore than 100.This series has ZZVP/N-16B normally open type(valve close for control pressure more than set value) andZZVP/N-16K normally close type (valve open for controlpressure more than set value).Standard specifications:BodyType: Fluid pressure balanced typeNominal size: 20, 25, 40, 50, 65, 80, 100Pressure rating: ANSI 150;PN16;JIS10KEnd connection; flange type (JIS B2201-1984, JB/T79.1-94, ANSI
B16.5-2009;HG20592-2009, HG20615-2009）
Body & Bonnet:SCPH2/WCB, SCS13A/CF8, SCS14A/CF8M
Packing: Non
Gasket: Non-asbestos rubber sheet
Principle diagram:
The action of ZZVP-16K is pressure -to-open. After P1 throttling, P2 connects the diaphragm case (top) by pressurepipe. It brings the down force at the effective area of bellows diaphragm, adding the spring first force (down). P3 guidedinto diaphragm case (bottom) brings the up force that is equal to that resultant force at the effective area of bellowsdiaphragm. There is a differential pressure between P3 and P2 that is set value. If differential pressure changes,increasing or reducing, this balance is destroyed and valve open wider or close smaller in the following to keep it as aconstant. If the differential pressure is less than set value, adjusting method: open the dustproof cover 1, turn bolt 2counterclockwise to reduce spring pressure and make the setting value meeting the requirement. Otherwise, turn bolt 2clockwise