In complex water systems, protecting infrastructure from damage is paramount. Sudden changes in water velocity, most commonly caused by pump power failures, can create dangerous pressure surges, or “water hammer.” Valvelink is proud to introduce the VMAL 900 Series “SA” Model Surge Anticipating Valve, a crucial component for maintaining the integrity and longevity of your water supply, firefighting, industrial, and agricultural irrigation systems.
The VMAL Surge Anticipating Valve is an automatic hydraulic control valve engineered to proactively address and relieve these damaging surge pressures. By anticipating and reacting to the pressure fluctuations that follow a pump stoppage, this valve ensures your system remains protected and operational.
The Critical Role of a Surge Anticipating Valve
When a pump in a pipeline suddenly stops due to a power cut, the forward momentum of the water column creates a rapid pressure drop, followed by a high-pressure reverse wave (upsurge). This violent fluctuation can lead to catastrophic failure of pipes, fittings, and pumps.
The VMAL Surge Anticipating Valve is designed specifically to counter this phenomenon. Its primary functions are:
- Rapid Opening: During a power failure, the valve detects the initial low-pressure wave and opens quickly.
- Pressure Relief: As the returning high-pressure surge wave arrives, the open valve diverts the excess pressure, safely discharging it from the system.
- Gradual Closing: Once the surge is dissipated and system pressure returns to normal, the valve closes slowly and gradually to prevent causing any secondary surges.
This two-stage operation makes the Surge Anticipating Valve a vital safeguard for any pumping system.
Features and Benefits of the VMAL-900 “SA” Model
The VMAL Surge Anticipating Valve is a line pressure-operated valve that offers robust performance and simple, reliable operation.
Key Features:
- Energy Independent: The valve operates on the main water pressure, eliminating the need for an external energy source.
- Dual Pressure Detection: It offers quick detection of both high and low-pressure waves, ensuring a swift response to surge events.
- Superior Protection: It effectively protects the entire water network from dangerously high pressures and can be used as a more compact alternative to equilibrium tanks.
- Simplified Design: The valve’s core control mechanism consists of a durable EPDM diaphragm and a spring. This design eliminates failure-prone components like shafts, bearings, or gaskets, ensuring reliability.
- Easy Maintenance: Thanks to its simple design and the inclusion of a finger filter, maintenance is straightforward and infrequent, typically only requiring periodic checks of the filter.
Technical Specifications:
- Body Material: Ductile Iron GGG40/50
- Diaphragm: EPDM
- Operating Pressure: Standard 1-16 Bar (10 – 240 psi)
- Operating Temperature: -10°C to +80°C
- Available Sizes: DN50 (2″) to DN300 (12″)
- Connections: Flanged (EN1092-2 ISO 7005-2)
- Coating: Standard Epoxy
Typical Application and Installation
For optimal performance, the Surge Anticipating Valve should be installed on a “T” branch off the main pipeline, just downstream from the pump and any check valves. It can be installed either horizontally or vertically, as long as the arrow on the valve body aligns with the direction of flow. The system should also include isolation valves for maintenance purposes.
Typical application showing the Surge Anticipating Valve (4) installed near the Booster Pump (5).
Partner with Valvelink for System Protection
The VMAL Surge Anticipating Valve is more than just a component; it’s an investment in the security and reliability of your entire water system. By preventing surge-related damage, it reduces downtime, minimizes repair costs, and ensures operational stability.
At Valvelink, we are committed to providing high-quality process control solutions. Our expert team is ready to assist you in selecting the right valve for your specific needs.
