Control valve HM-C-ALT

irrigationmanualmetal

Overview
The Hydromodul-C altimetric control valve is a metal control valve designed for altimetric regulation in irrigation and waterworks. It maintains a set piezometric level using a pilot circuit that senses static pressure and actuates the main valve. The valve body is optimized for high hydrodynamics to minimise pressure loss and reduce stagnation zones.

Operation

• Altimetric pilot senses the static pressure of a remote tank or reservoir and modulates the main valve to keep the level constant.
• Two-way altimetric pilot governs the main valve command.
• Needle (shut-off) valves allow adjustment of actuation speed and dynamic response.

Main features

• High-hydrodynamic globe body without stagnation pockets to lower pressure loss.
• Standard material: ductile cast iron GS500 / GGG50; carbon steel available on request.
• 200°C furnace polyester powder coating with minimum 250 μm thickness.
• Plunger shaft fully guided; guide independent from the seal seat.
• Plunger disc and seat profile designed to reduce cavitation risk.
• Optional removable stainless steel seat for enhanced cavitation resistance.
• Obstacle-free full port design — no spokes or grid in the flow passage to reduce clogging and maintenance.
• Optional dissipating cage obturator can be fitted without modifying the valve body to dissipate higher pressure and stabilise opening.
• Stainless steel shaft and return spring; spring located outside the flow path to avoid turbulence and clogging.
• Stainless steel bolts secure cover to main body.
• Nylon-reinforced Buna-N diaphragm and anti-abrasion polyurethane plunger seal disc.
• Designed for easy maintenance: internal parts accessible without removing the valve from the pipeline; pressure/command connections routed over the cover for pilot circuit maintenance while valve remains in service.
• Optional drain plug at valve bottom for full drainage in case of frost.
• Main function pressure gauge included for pilot calibration; additional gauges optional.
• Valve functions can be modified or extended through simple pilot circuit changes.

Applications

• Level control in elevated tanks and reservoirs.
• Irrigation systems, water supply networks, treatment plants and industrial waterworks requiring level regulation without electrical sensors.

Standards conformity

• Flange-to-flange dimensions: UNI-EN 558-1, DIN 3202 series F5.
• Flange drilling: ISO PN10-16; ANSI 150-300 compatible on request.
• Compliant with potable water requirements: DM174 / GU166 / DE98/83CE.

Technical specifications

• Model family: Hydromodul-C.
• Body material (standard): ductile cast iron GS500 / GGG50 (carbon steel on request).
• Surface finish: 200°C furnace polyester powder paint, ≥250 μm.
• Seat options: standard seat; removable stainless steel seat (optional) for cavitation resistance.
• Internal seals: nylon-reinforced Buna-N diaphragm; anti-abrasion polyurethane plunger seal disc.
• Shaft and fasteners: stainless steel shaft and return spring; stainless steel cover bolts.
• Flow path: full port, obstacle-free design.
• Optional accessories: dissipating cage obturator, drain plug, additional pressure gauges.
• Standards: UNI-EN 558-1, DIN 3202 F5; flange drilling ISO PN10-16 (ANSI 150-300 on request); potable water compliance DM174 / GU166 / DE98/83CE.

Documentation

• Datasheet available (PDF, 1.51 MB).