SOLENOID VALVES Namur Standard Single Sol 5/2 Way 1/4 and Namur Standard Double Sol 5/2 Way 1/4

Single‑Solenoid (Mono‑stable) 5/2‑Way Namur Valve – 1/4″

These are spring-return (mono-stable) valves—one solenoid coil on one end, the other end has a spring. When de‑energized, the valve returns to its default position via the spring.

Example (ENS Model)

• Interface: Namur (mounts directly on pneumatic actuator)

• Port Size: 1/4″ BSP

• Function: 5‑way, 2‑position, single solenoid with spring return, servo‑assisted

• Manual Override: Yes

• Coil: Fully encapsulated low-wattage (AC 5.5 VA, DC 4.8 W), Class F insulation, 100% duty

• Pressure Range: 1.5 to 8 bar

• Media Temperature: 5 °C to 80 °C

• Materials:

  • Body: Aluminium

  • Spool: Aluminium

  • Operator: Stainless steel

  • Seals: NBR

  • Ends: POM

• Weight / Orifice / Flow: Orifice 5 mm, CV ≈ 1.4, weight ~0.5 kg

• Threads: ISO 7.1 sealing threads

Another Example (TORK NM52W1S)

• Port Size: G (BSP) 1/4″

• Coil Voltages: Multiple options (230/220 VAC, 110 V, 24/12 V AC or DC)

• Protection: IP65

• Ambient Temperature: –5 °C to +60 °C

• Switching Time: <30 ms

• Working Pressure: 0.5 to 10 bar

Summary Table – Single‑Solenoid 5/2‑Way Namur

Double‑Solenoid (Bi‑stable) 5/2‑Way Namur Valve – 1/4″

Double‑solenoid valves have two coils—one at each end—for bistable operation. They hold position even when no power is applied (memory effect).

Example (END12*5)

• Interface / Mounting: Namur

• Port Size: 1/4″ BSP

• Function: 5‑way, 2‑position with double solenoid, servo-assisted

• Manual Override: Yes

• Coil: Low-wattage, fully encapsulated, Class F insulation, 100% duty

• Pressure Range: 1.5 to 8 bar

• Media Temperature: 5 °C to 80 °C

• Materials:

  • Body: Aluminium

  • Seals: NBR

• Orifice / CV / Weight: Orifice 5 mm, CV ≈ 1.4, weight ~0.5 kg

• Power Options: 12 V DC, 24 V DC, 24 V AC, 110 V AC, 240 V AC, 415 V AC

Example (Hafner MNK 520 701)

• Port Size: G 1/4″

• Air Flow: 1250 l/min

• Function: Double‑solenoid, bistable

• Power Consumption: 1.8 W / 3 VA (very low power)

• Operating Pressure: 2 to 10 bar

• Interface: Namur

• Manual Override: Yes

Key Differences: Single vs Double Solenoid

Summary Descriptions

1. Namur Standard Single-Solenoid 5/2-Way 1/4″ Valve

A Namur‑interface, 5‑way-2‑position pneumatic solenoid valve featuring a single solenoid with spring return. It mounts directly onto pneumatic actuators, offers manual override, low-wattage Class‑F insulated coil, aluminium body, NBR seals, and operates typically between 1.5–8 bar (some up to 10 bar). Suitable for fast, reliable electric-over-air actuator control.

2. Namur Standard Double-Solenoid 5/2-Way 1/4″ Valve

This is a bistable (double-solenoid) 5‑way-2‑position valve with a Namur interface. It has two solenoid coils (one at each end), allowing the valve to maintain position without holding power. Features include servo-assisted operation, manual override, aluminium body, NBR seals, IP65 protection, and operational pressure range from 1.5 (or 2) to around 8–10 bar. Some models (e.g. Hafner) consume only ~1.8 W—ideal for low-power applications.