Honeywell VP531C1000 Pneumatic Valve – Normally Open, 1/2" NPT
Product Overview
The Honeywell VP531C1000 is a normally-open, 2-way pneumatic valve designed for use in terminal units requiring precise control with an equal-percentage flow characteristic. This unitary valve delivers stable, accurate modulation for hydronic heating, cooling, and low-pressure steam applications.
With a durable brass body, high temperature tolerance, and dependable pneumatic actuation, the VP531C1000 is ideal for commercial HVAC systems that demand long service life and consistent performance.
✅ Key Features
-
✔️ Normally-open 2-way pneumatic valve
-
✔️ 1/2" NPT threaded connections
-
✔️ Equal-percentage flow control for precise modulation
-
✔️ Suitable for hydronic heating/cooling and low-pressure steam
-
✔️ Cv rating of 1.6 for regulated flow capacity
-
✔️ Handles temperatures from 35°F to 250°F
-
✔️ Max body pressure: 150 psi
-
✔️ Optional spring ranges available (Green 2–5 psi, Orange 3–10 psi)
-
✔️ Honeywell commercial-grade reliability
🔧 Specifications
| Specification | Details |
|---|
| Model |
VP531C1000 |
| Type |
Pneumatic Unitary Valve |
| Body Pattern |
2-Way |
| Operation |
Normally Open |
| Connection |
1/2" NPT Threaded |
| Flow Capacity (Cv) |
1.6 |
| Spring Range |
2–5 psi (Green) / 3–10 psi (Orange) |
| Max Temperature |
250°F |
| Temperature Range |
35°F – 250°F |
| Max Body Pressure |
150 psi (1034 kPa) |
| Max Safe Air Pressure |
20 psi (200 kPa) |
| Max Differential Pressure |
20 psi Water / 10 psi Steam (VP531C only) |
| Application |
Terminal units, hydronic systems, low-pressure steam |
| Flow Characteristic |
Equal Percentage |
⚠️ Common Symptoms of a Failing Pneumatic Valve
-
Inconsistent heating or cooling output
-
Valve stuck open or stuck closed
-
Slow or unresponsive modulation
-
Air leaks in pneumatic control line
-
Erratic terminal unit temperature swings
❓ Frequently Asked Questions (FAQ)
Q: Is this valve normally open or normally closed?
A: The VP531C1000 is normally open.
Q: Can this valve be used for steam?
A: Yes—up to 10 psi differential pressure on VP531C models.
Q: What spring ranges are available?
A:
-
Green: 2–5 psi
-
Orange: 3–10 psi
Q: Is it suitable for chilled water?
A: Yes. Operating range is 35°F to 250°F, making it ideal for hot or chilled water.
Q: What systems typically use this valve?
A: Fan coils, VAV reheat coils, terminal units, and other pneumatic-controlled hydronic circuits.
🛒 Shopping Tips
-
Match the Cv rating (1.6) to your system’s flow requirements.
-
Verify your pneumatic control pressure matches the spring range needed.
-
Ensure the valve body pressure rating (150 psi) meets your system requirements.
-
For steam applications, confirm that your differential pressure does not exceed 10 psi.
-
Always confirm connection type and pipe size (1/2" NPT).
