Self-Operated Pressure Regulating Valve
Pilot-Operated · DN25–DN300 · PN16/PN40 · No External Power
Reguvale's self-operated pressure regulating valve uses the line fluid itself as the power medium - no electricity, no compressed air, no instrument air. A sensing diaphragm detects downstream pressure and modulates the plug to keep the setpoint stable against inlet pressure and flow swings.
Available in direct-acting (small sizes, simple duty) and pilot-operated (large sizes, high accuracy) configurations. Setpoint is field-adjustable via a single spring, and the regulator self-contains the entire control loop - ideal for remote pipelines, district heating stations and unmanned installations.
Standard sizes DN25–DN300 in PN16 / PN40 cover most district-heating, oilfield and long-distance pipeline duty. Stainless or alloy trim, and pressure-balanced bellows options are available on request.
Key Features
No External Power Required
Operates entirely from line-fluid energy - perfect for unmanned sites, district-heating stations and remote pipelines where power is unavailable.
Simple & Reliable
Single spring, one diaphragm and a pilot - few moving parts mean long service life and very low maintenance cost.
Pilot or Direct Acting
Direct-acting models cover small sizes and tight accuracy; pilot-operated designs handle large DN and high pressure drop with stable control.
Field-Adjustable Setpoint
Change the spring to retune the downstream pressure setpoint without removing the valve from the line.
Pressure-Balanced Plug
Bellows or pressure-balanced trim is available for high-pressure-drop service and to prevent seat wear.
Self-Contained Loop
No air lines, no signal cables, no PLC - the regulator is a complete control loop in one body.
Technical Specifications
| Parameter | Specification |
|---|---|
| Body Material | WCB Carbon Steel / SS304 / SS316 / Ductile Iron GGG50 |
| Plug / Trim | SS304 / SS316 / 17-4PH |
| Seat Material | SS316 / Stellite-faced / PTFE |
| Body Type | Globe, single-seat pressure-balanced |
| Size Range | DN25 – DN300 (1" – 12") |
| Pressure Rating | PN16 / PN40 (ANSI 150 / 300 on request) |
| End Connection | Flanged (ISO 7005-2 / ASME B16.5) |
| Flow Characteristic | Equal-Percentage (pressure-reducing) |
| Actuator Type | Self-operated diaphragm, direct or pilot-operated |
| Control Signal | Downstream pressure feedback (internal) |
| Setpoint Range | 0.5 – 16 bar (other ranges on request) |
| Bellows Option | Available for high pressure drop |
| Temperature | -40→+425°C depending on seat material |
| Accuracy | ±5% of setpoint (typical) |
| Standards | IEC 60534 / GB/T 4213 / ANSI/ISA-75 |
| Certification | ISO 9001:2015, SGS MTC available |
Frequently Asked Questions
What does a self-operated pressure regulating valve do?
It keeps the downstream pressure at a fixed setpoint without needing electricity or compressed air - the line fluid itself powers the diaphragm that drives the plug.
Direct-acting or pilot-operated - which do I need?
Direct-acting suits small DN (typically ≤ DN50) and modest flow.
Pilot-operated is required for large DN, high flow or when you need tight accuracy under varying inlet pressure.
Where is a self-operated regulator typically installed?
District-heating substations, long-distance oil & gas pipelines, wellhead skids and any unmanned location where compressed air or instrument power is not available.
Applications & Use Cases
District Heating
Pressure-reducing stations between primary and secondary networks; substation control without instrument air.
Oil & Gas Pipelines
Long-distance crude, gas and product line pressure reduction at intermediate stations.
Steam Systems
Steam header pressure control in plant and shipboard service.
Building Pressure
Booster-set pressure control, pump-discharge stabiliser and rooftop equipment pressure limiting.
