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Key Features

  • 2/2 Way Normally Closed
  • Zero Pressure Assisted Lift
  • Isolated Dry-Armature Design
  • Zero Differential Pressure
  • 1/4" BSP Connection
  • Optional NPT Thread
  • 0 to 1 Bar Pressure Range
  • 6.5mm Valve Orifice
  • 4.7 L/min Water Flow
  • Corrosion-Resistant PVC Body
  • PTFE Sealing System
  • PTFE-Coated Diaphragm
  • Strong Acid & Alkali Service
  • PVC Resistance pH 3–11
  • Media Temperature to +80°C
  • Fluids up to 20 cSt
  • Not Suitable for Vacuum
  • Class F Solenoid Coil
  • 80% Duty Rated Coil
  • IP65 With DIN Connector
  • Flying Lead Coil Option
  • Multiple AC/DC Voltages

Datasheets

Description

1/4" PVC Solenoid Valve for Chemical Dosing – UDC8


The UDC8 is a compact 1/4" 2/2 way normally closed solenoid valve designed for controlling strong acids, alkalis and corrosive chemical fluids compatible with PVC and PTFE.

Featuring a corrosion-resistant PVC valve body with a PTFE sealing system and isolated dry-armature construction, the UDC8 helps protect the solenoid mechanism from aggressive process media. The manufacturer specifies the UDC range for strong acid and strong alkali service, with PVC body corrosion resistance stated as pH 3–11.

The zero-pressure assisted-lift design operates from 0 Bar without requiring a minimum pressure differential, making it suitable for chemical dosing, water treatment, laboratory equipment and industrial process applications where conventional metallic valves may be unsuitable. The UDC8 is rated from 0 to 1 Bar with a 6.5mm orifice and 4.7 L/min water flow at 1 Bar pressure drop.

Valve Function & Operation

Function: 2/2 way normally closed
Operation: Assisted lift
Design: Isolated dry armature
Normal Position: Closed when de-energised
Energised Position: Open
Minimum Differential Pressure: 0 Bar
The assisted-lift design allows the UDC8 to operate from zero pressure while the isolated construction helps separate aggressive process media from the solenoid armature mechanism. 

Ports & Connections

Port Size: 1/4" BSP
Optional Thread: NPT
The compact 1/4" connection makes the UDC8 particularly suitable for chemical dosing equipment, laboratory systems, OEM machinery and smaller process lines.

Pressure & Performance

Operating Pressure: 0 to 1 Bar
Minimum Differential Pressure: 0 Bar
Orifice: 6.5mm
Water Flow: 4.7 L/min at 1 Bar pressure drop
Maximum Media Viscosity: 20 cSt
Vacuum: Not suitable

Construction & Materials

Body: PVC
Seals: PTFE
Diaphragm: NBR with PTFE coating
Solenoid Tube: Stainless steel
Armature: 430F stainless steel
Shading Ring: Copper
Coil Housing: Resin or metal
The PVC body is specified for corrosion resistance across approximately pH 3–11, making the UDC8 suitable for many aggressive chemical applications where brass or conventional metallic valve bodies would be unsuitable.

Chemical & Media Compatibility

Suitable for compatible:
✓ Strong acids
✓ Strong alkalis
✓ Hydrochloric acid (HCl)
✓ Sulphuric acid (H₂SO₄)
✓ Chemical dosing fluids
✓ Water-treatment chemicals
✓ Corrosive process liquids
✓ Compatible gases
Media must be chemically compatible with the PVC body, PTFE sealing components and other wetted materials.
For especially aggressive chemicals or concentrations outside the useful resistance range of PVC, consider the PTFE-bodied UDC-TF version.

Temperature

Media Temperature: -5°C to +80°C
Ambient Temperature: -10°C to +40°C

Coil & Electrical

Coil Type: M
Insulation: Class F 155°C
Duty Rating: 80%
Electrical Connection: DIN 43650A
Protection: IP65 with connector fitted
Optional Connection: IP54 flying leads
AC Maximum ON Time: 2 hours
AC Minimum Cooling Time: 30 minutes
DC Maximum ON Time: 30 minutes
DC Minimum Cooling Time: 7.5 minutes

Voltage Options

12V DC
24V DC
24V AC
110V AC
230V AC
AC versions are available for 50 or 60Hz operation.

Typical Applications

✓ Acid dosing systems
✓ Alkali dosing systems
✓ Chemical dosing equipment
✓ Water treatment systems
✓ Laboratory equipment
✓ Chemical processing machinery
✓ Corrosive fluid control
✓ OEM chemical equipment

Why Choose the UDC8?

The UDC8 combines a corrosion-resistant PVC body, PTFE sealing system and isolated dry-armature design in a compact 1/4" solenoid valve.
Unlike conventional pressure-assisted diaphragm valves requiring inlet pressure to operate, the UDC8 operates from 0 Bar, making it particularly useful for low-pressure chemical dosing and gravity-fed process systems.
For chemicals requiring greater corrosion resistance, the UDC range is also available with a full PTFE body, specified by the manufacturer for approximately pH 0–14 service.

Related Products & Categories


Plastic Solenoid Valves Strong Corrosive Chemicals

WRAS Approved Plastic Solenoid Valves

Solenoid Valves for Slightly Corrosive Chemicals

UPVC Motor Actuated Ball Valves
View Technical Specification

Technical Specification

Brand: Di-Hen miT-UniD-cns

Model: UDC8

Width: 54.00 mm

Height: 103.00 mm

Depth: 54.00 mm

Weight: 0.60 kg

Valve / Product Type: Solenoid Valve

Body Material: PVC

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

Port Size: 1/4 thread

Function: 2/2 Failsafe Closed

Operation: Direct Acting from 0 Pressure

Pressure: 0.02 Bar (20 mBar), 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

Seals: PTFE (Teflon)

Approvals:: IP65, UL

Media: Fluid (Stong Acid/Alkali), Gases (Strong Acid/Alkali)

Orifice: 6.5mm

Found in these Categories

1/4 BSP PVC solenoid valve 0-1 Bar 2/2 way Normally Closed

£160.78 incl. VAT £133.98 ex. VAT

-19% Was £199.32 incl. VAT
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Brand: Di-Hen miT-UniD-cns

Model: UDC8

Stock: 2 in stock

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