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A proportional valve converts an electrical signal (4–20 mA, 0–10 V or IO-Link) into a continuous, infinitely-variable pressure or flow output — the right choice whenever a process needs precise control rather than simple on/off. NorTrade distributes the full Norgren IMI range, from miniature OEM units to ATEX-rated failsafe I/P converters, plus the Watson Smith 140 Failsafe for hazardous areas. Seven series cover open-loop control, closed-loop microprocessor control, high-flow servo and 5/3 directional motion control.
Output 0.2-1 or 0.2-2 bar from a 4-20 mA (2-wire) signal; supply 1.2-10.3 bar. Flow up to 300 NL/min, air consumption <2.5 NL/min at 50% signal. Ambient -40..+85 °C. Integral bracket for flat-surface or 2" pipe mounting in any orientation. Ex d IIC T4 Gb + Ex ia IIC T4 Ga + FM + CSA certifications.
Forward and relief flow > 300 Nl/min. Ambient -40 … +85 °C. Temperature sensitivity < 0.1% span/°C, supply sensitivity < 0.075% span per % supply change. Vibration effect < 5% of span (4 mm p-p, 5–15 Hz; 2 g, 15–150 Hz). 1.0 kg.
Compressed air, oil-free and dry, filtered to 5 μm. Air consumption typically ≤ 3 Nl/min at 6 bar, ≤ 10 Nl/min at 8 bar. Response time < 500 ms (0→100%) or < 150 ms (100→0). Vibration & shock immunity < 3% output shift for ±2 g 15–150 Hz. Ambient 0 … +60 °C.
Pressure ranges 0–2 / 0–10 / 0–16 bar with nominal sizes DN 8 and DN 16. Filtered (50 μm), unlubricated compressed air or neutral gases. Ambient media -5 … +50 °C (no condensation), ambient -5 … +60 °C. Flow direction 1→2 and 2→3.
Compressed dry air, oil-free filtered to 5 μm. Supply pressure ≥ 2 bar above maximum output. Linearity < 1%, hysteresis < 1%, vibration & shock immunity < 3% span (0.75–1 m/s², 5–150 Hz). Ambient 0 … +50 °C. Aluminium body, zinc die-cast lid, Grivory front cover. No maintenance.
Compressed dry air, oil-free filtered to 5 μm. 4–20 mA or 0–10 V input (factory set). 24 V DC ±25% supply, power consumption < 1 W. Linearity < 1%, hysteresis < 1%, temperature sensitivity better than 0.03% span/°C. Aluminium body, zinc die-cast lid, nylon front cover. 0.60 kg.
Air per ISO 8573-1 grouping 2-3-1, filtered (recommended < 3 μm), dried, non-lubricated. Imperial flow equivalent ~0.0081 Cv per 8 Nl/min. Ambient 0 … +60 °C, media +5 … +60 °C, storage -20 … +80 °C, no condensation. Anodised aluminium housing, NBR static seals. 1.25 kg.
A proportional valve converts an electrical signal (typically 4–20 mA or 0–10 V) into a continuously variable pneumatic output — pressure (VP10, VP12, VP23, VP50, VP51) or flow + direction (VP60). Use it whenever a process needs more than on/off control: precision force, controlled speed, leak testing, tension control, position servo, etc.
Open-loop valves (VP10, VP12 and the 140 I/P converter) convert the signal to pressure without measuring the actual output — simple, rugged, low-cost; open-loop linearity is typically around 1–1.5% of span (e.g. VP12 < 1.5%). Closed-loop valves (VP23, VP50, VP51) include an internal pressure sensor and electronics — a microprocessor on VP23 — that adjust the output until the actual pressure matches the setpoint — typically ±0.5% on VP23 and < 1% on VP50/VP51, with immunity to load and supply changes.
4–20 mA is the most noise-immune analogue choice over long cable runs (≥ 5 m) and is the de facto process-industry standard. 0–10 V is convenient for short runs and panel-mounted controllers. IO-Link (VP23, VP60) replaces both with a single digital cable that carries setpoint, actual value and diagnostics — the right choice when integrating with a modern PLC.
The 140 Failsafe is the answer when two requirements collide: (1) hazardous-area operation (ATEX / Intrinsically Safe / Explosion proof, IP66 / NEMA Type 4X) and (2) a safe state on signal failure (output falls to zero). Typical applications: oil & gas, chemicals, pharma — outdoors, on a pipe, in a Zone 1/Zone 2 environment.
I/P (current-to-pressure) converts a 4–20 mA current signal into a proportional pressure. E/P (voltage-to-pressure) does the same for a 0–10 V (or similar) voltage signal. The VP10 acts as an I/P or E/P converter depending on the model variant selected; the Watson Smith 140 is an I/P converter (4–20 mA input only).
Yes — VP12 (1/8"), VP50 and VP51 are manifold-mountable; VP60 uses G1/4 / 1/4 NPT or ISO 1 flange mounting. Manifold mounting saves space and tubing in OEM and rack-mount applications. Confirm port pattern and pressure rating against the manifold before ordering — our engineers can assist.
