Key Features

3/4" Normally Open Nylon Valve
2/2 Way Normally Open
Fail-Open Valve Operation
Energise to Close Operation
Zero Pressure Assisted Lift
No Minimum Pressure Required
Vacuum Capable to 10⁻¹ Torr
AC Pressure 0–5 Bar
DC Pressure 0–4 Bar
23mm Full Flow Orifice
97.24 L/min Water Flow
Glass Reinforced Nylon Body
Stainless Steel Internals
EPDM Seals as Standard
Optional NBR & FKM Seals
RO, Pure & Demineralised Water
Media Viscosity Up to 50 cSt
Media Temperature Up to +60°C
15W AC Nass Magnet Coil
18.5W DC Nass Magnet Coil
DIN 43650A IP65 Connection
Optional ATEX Coil Available

Datasheets

Description

3/4 Inch Nylon Normally Open Solenoid Valve – Zero Pressure 2/2 Way NO – Sunwell NOPK20

The Sunwell NOPK20 is a high-performance 3/4 inch normally open nylon solenoid valve designed for reliable operation with zero pressure differential. Its assisted-lift diaphragm design enables operation from vacuum or zero pressure, making it ideal for low-pressure water systems, reverse osmosis (RO) equipment, demineralised water, vacuum applications and light chemical processes.

In its de-energised state the valve remains open, closing only when the coil is energised. The corrosion-resistant nylon body combined with stainless steel internal components provides excellent durability whilst remaining lightweight and resistant to many slightly aggressive media.

Supplied with EPDM seals as standard, the NOPK20 is also available with optional NBR or FKM seals and an optional ATEX certified coil for hazardous area installations.

Valve Specification

Function: 2/2 way normally open

Operation: Assisted-lift diaphragm (zero pressure rated)

Port Size: 3/4" BSP (optional NPT or Rc)

Orifice: 23 mm

Flow Factor (Kv): 97.24 L/min

Pressure Range:

AC Coil: 0–5 Bar

DC Coil: 0–4 Bar

Maximum Media Viscosity: 50 cSt

Opening Time: 0.2–0.5 seconds

Closing Time: 1–4 seconds

Mounting Position: Coil upright preferred.

Construction

Body: Glass reinforced nylon

Internal Parts: Stainless steel

Seal Material: EPDM (Standard)

NBR (Optional)

FKM (Optional)

Shading Ring:

Silver (AC)

None (DC)

Electrical Connection: DIN 43650A

IP65 with connector

Coil Specification

AC Coil:

15 Watt Nass Magnet

Class F (155°C)

100% continuous duty

DC Coil:

18.5 Watt Nass Magnet

Class F (155°C)

100% continuous duty

Voltages:

12VDC

24VDC

48VDC

24VAC

48VAC

110VAC

230VAC

380VAC

Hazardous Area Option

Optional ATEX Ex mb certified coil available:

Ex mb IIC T4 Gb

Ex mb tb IIIC T130°C Db

Suitable for Zones 21 & 22

Maximum operating pressure with ATEX coil:

AC: 3 Bar

DC: 1 Bar

(without AC shading ring).

Media Compatibility

Suitable for:

Air

Water

Pure water

Demineralised water

Reverse osmosis (RO) water

Vacuum to 10⁻¹ Torr

Slightly aggressive fluids

Most gases compatible with the selected seal material and valve construction.

Pressure & Temperature

Working Pressure:

AC Coil: 0–5 Bar

DC Coil: 0–4 Bar

Media Temperature: Up to +60°C

Ambient Temperature: +4°C to +50°C.

Typical Applications

Normally open water control systems

Reverse osmosis (RO) water purification

Demineralised water systems

Vacuum systems

Chemical dosing equipment

Water treatment plants

Industrial process control

Laboratory equipment

Related Products & Categories

UPVC Motor Ball Valves

Plastic Solenoid Valves for Chemicals

2/2 Normally Open Stainless Steel Solenoid Valves

View Technical Specification

Technical Specification

Brand: AAA Enterprise (Sunwell)

Model: NOPK20

Width: 56.00 mm

Height: 90.00 mm

Depth: 71.00 mm

Weight: 0.80 kg

Valve / Product Type: Solenoid Valve

Body Material: Nylon

Voltage: 110vAC, 12vDC, 230VAC, 24vAC, 24vDC, 48vAC, 48vDC

Port Size: 3/4 thread

Function: 2/2 Failsafe Open

Operation: Assisted Lift from 0 Pressure

Pressure: 0.1 Bar (100 mBar), 0.2 Bar (200 mBar), 0.3 Bar (300 mBar), 0.4 Bar (400 mBar), 0.5 Bar (500 mBar), 0.6 Bar (600 mbar), 0.7 Bar (700 mBar), 0.8 Bar (800 mBar), 1 Bar, 1.2 Bar, 1.3 Bar, 1.4 Bar, 1.5 Bar, 1.6 Bar, 2 Bar, 2.5 Bar, 3 Bar, 3.5 Bar, 4 Bar, 4.5 Bar, 5 Bar, 5.5 Bar, 6 Bar, 6.5 Bar, 7 Bar

Seals: EPDM, NBR, FKM (Viton)

Approvals:: ATEX Exm, IP65

Media: Air, Fluid (Non Aggressive), Fluid (Slight Acid/Alkali), Gases (Non Aggressive), Gases (Slight Acid/Alakli), Vacuum (Low), Water, Water (RO/Pure/Demin)

Options required: Mounting Holes

Orifice: 23mm

Found in these Categories

3/4 Nylon solenoid valve 0-7 Bar 2/2 N/Open (NOPK20) 23mm

Name: 3/4 Nylon solenoid valve 0-7 Bar 2/2 N/Open (NOPK20) 23mm
Brand: AAA (Sunwell)
SKU: NOPK20
Price: 171.47 GBP
Availability: InStock

£171.47 incl. VAT £142.89 ex. VAT

-19% Was ~~£211.49~~ incl. VAT

Select Thread Type

Add To Cart

Brand: AAA Enterprise (Sunwell)

Model: NOPK20

Stock: 22 in stock

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Read Full Description

Key Features

Datasheets

Description

3/4 Inch Nylon Normally Open Solenoid Valve – Zero Pressure 2/2 Way NO – Sunwell NOPK20

Valve Specification

Construction

Coil Specification

Voltages:

Hazardous Area Option

Media Compatibility

Pressure & Temperature

Typical Applications

Related Products & Categories

Technical Specification

Found in these Categories

3/4 Nylon solenoid valve 0-7 Bar 2/2 N/Open (NOPK20) 23mm

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