Solenoid valves for compressor units ASTA series ESK 520-521 direct action

DN: 3/8"-1"
Body material: brass
Connection: threaded

Overview Model overview Those. information Download Colors DOP, CAD

Overview

Low resistance, no pressure drop required, 360° rotating coil, various orifice options, light weight, patented technology, quick closing and opening, long service life.

Options

Custom parameters can be made to order
Option: NPT (ANSi 1.20.3), R (BSPT/ISO 7–1), W (BSP), M (metric)
Option: Diaphragm, seat and stem seal can be made of NBR (-10 °C…80 °C)
Option: various body coatings, nickel plating, various body materials, internal elements made of stainless steel (for ESC 521), manual override, stainless steel seat, filter, other connections, with two or four mounting holes in the bottom of the valve
Option: other voltage, frequency 60 Hz, coil insulation class F (155 °C), coil fixation
Option: with electronic timer, coil explosion protection for operation in zones 1/21–2/22 (Eex em II T4/T5), coil insulation material – can be reinforced with fiberglass (V0 or V1)
Option: terminal with LED, or without terminal, terminal with visual indicator and peak voltage, connector with 2 m cable, flat terminals (cable ∅8–10 mm), non-flammable connectors
Other versions on request

Materials

Body: brass
Plunger seal: VITON
Insulating tube: stainless steel (AISI 430FR and AISI 304) for ESC 520, stainless steel (AISI 430FR and AISI 304) or brass for ESC 521
Plunger: stainless steel (AISI 430FR)
Springs: stainless steel (AISI 302)
Shielding coil: copper
Seat: brass
Sealing rings: NBR
Internal parts: stainless steel or brass

Model overview

Those. information

Medium: air, inert gases, water, not applicable for aggressive liquids and gases
Safety function: Normally Closed (NC) (ESK 520 Series) and Normally Open (NO) (ESK 521 Series)
Control type: direct acting
Number of strokes: 2/2 (Ports/Positions)
Dimensions: G3/8" – G1/2"
Connection: Thread G (BSPP / ISO 228–1)
Pressure ranges: 0–7 bar (ESK 520), 0–10 bar (ESK 521)
Media temperature: -10 °C … +160 °C
Ambient temperature: -20 °C – +70 °C
Opening time: 25ms
Closing time: 25ms
Maximum viscosity: 38cSt or mm2/s
Maximum permissible pressure: 10 bar (ESK 520), 15 bar (ESK 521)
No minimum differential pressure required, internal exhaust system (for ESK 521)
Valve seal: O-rings
Voltage: AC, DC
Rearrangement of the coil without dismantling the valve (independently of AC, DC)
Low pressure loss, low power consumption
Installation in any position, but optimally with the coil facing upwards
The medium must be filtered before the valve
Flow rate (Q) can be calculated from the values of pressure, density and flow coefficient
In accordance with 97/23/EC Pressure Equipment Directive (PED), 2006/95/EEC Low Voltage Directive (LVD), 2004/108/EC Electromagnetic Compatibility Directive (EMC)