Folder ZSN 30 pages

SELF-ACTUATING DIFFERENTIAL PRESSURE RELIEF REGULATORS TYPE ZSN3
APPLICATION AREA:
Regulators ZSN3 are used to control preset pressure in process installations connected to regulator valve inlet.
Regulators are applied in heating systems, in industrial processes with cold and hot water, steam, air and nonammable gases. Using with other media subject to consulting with manufacturer.

DESIGN:
Regulator comprises three, temporary fastened main units: valve (01),
actuator (02) and adjuster (03). Regulator valve single-ported with balanced
plug. Flanged connections of valve body with valve face as per
PN-EN 1092-1:2006 and PN-EN 1092-2:1999 for PN10; 16; 25; 40
PN-EN 1759-1:2005 for CL150; CL300.
Body length as per:
PN-EN 60534-3-1:2000 – Series 1 for PN10; 16; 25; 40;
Series 37 for CL150; Series 38 for CL300
Valve tightness – bubble (Class VI as per PN-EN 60534-4), tight seat in
PTFE or VMQ (ECOSIL).
Diaphragm actuator (diaphragm effective area 80 cm2), with clammed
housing or diaphragm actuator (diaphragm effective area 160 cm2), with
bolted housing.
Control pressure value adjuster with combination of three pre-tensioned
springs, xed coaxially with valve and actuator.

VARIANTS:
By corrosion-proofness of actuator components:
• standard (ZSN 3.1) - carbon steel with protection coatings,
• special (ZSN 3.2) - stainless steel.
OPERATING PRINCIPLE:
Valve is closed when no supply. Controlled pressure is fed via impulse duct through connection (24) under
diaphragm (29) of actuator (02). Actuator second chamber is connected to atmosphere via deaeration plug
(25). Increase in control pressure above preset value, set by tensioning of spring unit (60) in adjuster (03),
causes deection of diaphragm, movement of actuator stem (37) and opening of valve plug (5) until controlled
pressure reaches value preset in booster.
Impulse collection point for controlled pressure is to be located upstream valve inlet.

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