Butterfly, conical, and gate valve systems used in dam and hydroelectric power plant (HEPP) facilities are essential hydromechanical equipment that ensures the safe and controlled direction of water, precise adjustment of the flow rate, and fast, secure shut-off when necessary. It is of great importance that these valves, which operate under high pressure, large flow rates, and harsh operating conditions, are designed according to project-specific engineering calculations, manufactured with high-strength materials, and installed in the field in accordance with technical standards.
Butterfly, conical, and gate valves can function as adjustment valves, service valves, or guard (emergency shut-off) valves depending on the hydraulic structure and operational requirements of the facility. The correct selection of the valve type is a critical determinant for facility safety, operational continuity, and long-term performance. Enermak stands out with its manufacturing and field installation services for butterfly, conical, and gate valves aimed at dam and hydroelectric power plant (HEPP) projects at its production facilities in Adana.
What are Butterfly Valves?
Butterfly valves are systems used in dam and hydroelectric power plant (HEPP) facilities, especially in penstock lines, for the safe shut-off of water flow under normal and emergency operating conditions. Thanks to the rotating disc structure, they offer quick and secure opening-closing in a short time and generally serve as shut-off valves. The usage purposes and operating characteristics of butterfly valves are as follows:
- Designed with special engineering calculations to open and close under balanced pressure conditions.
- Possess high strength to perform safe shut-off even under maximum flow rate and discharge conditions in emergencies.
- Not used as adjustment valves; their primary duty is the safe shut-off of the line.
- Widely preferred in normal operation and guard (emergency shut-off) valve applications.
What are the Main Components of Butterfly Valves?
Butterfly valves and auxiliary equipment consist of the following main parts: Valve body and disc, bearings and shaft system, upstream and downstream pipes, disassembly joint, by-pass piping and valves, drive and control units, energy dissipator and flow control elements (in guard valves), operating platforms, ladders, and test covers.
What are Conical Valves (Howell-Bunger / Ring-Jet Valves)?
Conical valves are special adjustment valves used in dam and hydroelectric power plant (HEPP) facilities, particularly in bottom outlets and discharge structures, to ensure the controlled and safe discharge of water under high pressure and flow rate into the atmosphere. Thanks to the conical outlet geometry, they disperse the water in a ring shape, creating an energy-dissipating effect. They are also referred to as Howell-Bunger valves or Ring-Jet valves in literature. Operating characteristics and application areas can be listed as follows:
- Allow precise and gradual adjustment of the flow rate.
- Significantly reduce the erosive effect downstream thanks to their energy-dissipating hydraulic structure.
- Widely used in irrigation, flood control, reservoir evacuation, and aeration applications.
- Can also function as pressure-reducing valves before the turbine with an appropriate hydraulic design.
What Basic Elements Constitute a Conical Valve System?
Conical valve systems generally consist of the following main components: Main body, control sleeve (adjustment sleeve), actuator system (drive and control mechanism), support hood, upstream connection pipe and flange (inlet pipe), energy-dissipating lining, service platforms, and inspection covers.
What are Gate Valves?
Gate valves are systems used in dam and hydroelectric power plant (HEPP) facilities, especially in bottom outlets and discharge structures, for the purpose of regulating water flow in a controlled manner or completely and safely closing the line in emergencies. These valves, which operate with linear movement, can function as adjustment valves or guard (emergency shut-off) valves depending on their design.
How do Gate Valves Operate and Where are They Preferred?
Use as Guard Valve: Usually operates in the fully open or fully closed position during normal operation; used in emergencies to isolate the line safely and quickly.
Use as Adjustment Valve: Allows for the controlled and gradual adjustment of the desired flow rate and plays a role in the balanced management of the reservoir level.
What are the Main Components of Gate Valve Systems?
Gate valve systems generally consist of the following main components:
- Inlet – outlet body (upstream and downstream bodies),
- Gate-leaf (gate plate / sliding gate),
- Upper housing and sealing elements (gate housing / seal system),
- Upstream and downstream transitions (transition piece / reduction adapter),
- Drive and control units (lifting mechanism / actuator system),
- By-pass piping and valves (balance line / auxiliary line system),
- Aeration pipes (air release line),
- Mounting supports and connection rings (support legs / anchor elements).
How do Drive and Control Systems Work and How are They Selected?
Drive and control systems in valve units are critical components that ensure the safe, controlled opening and closing of the valve in accordance with operating conditions. The drive type to be used is determined by considering the valve diameter, operating pressure, hydraulic loads, and required opening-closing forces. The basic features of drive and control systems are as follows:
- Valve systems can be equipped with manual, electric motor-driven, or hydraulic drive mechanisms.
- Balanced pressure conditions are provided by by-pass valves to reduce sudden loads that may occur during opening and closing.
- In applications where the opening-closing force exceeds 20,000 kg, hydraulic drive systems or counterweight mechanisms are preferred due to high security and control capability.
- The system is strictly designed to offer manual backup operation for cases where electrical energy is unavailable or interrupted.
Manual control systems:
- Projected to operate with a maximum lever force of 10 kg.
- Designed with a handwheel structure.
- Include a safety device that automatically disables electrical control when manual operation is engaged.
How are the Prices of Butterfly, Conical, and Gate Valves Determined?
The prices of butterfly, conical, and gate valves are determined depending on the valve type and diameter, operating pressure, flow rate values, material quality used, drive and control system (manual, electric, or hydraulic), sealing and safety requirements, and project and installation conditions. In addition, engineering design, manufacturing details, testing, and commissioning services are the primary factors affecting the total cost.
Quality Standard Compliant Production and Reliable Valve Options from Enermak
Enermak produces butterfly, conical, and gate valves in accordance with national and international quality standards and specific project engineering calculations. Valve systems manufactured using high-strength and corrosion-resistant materials are shipped to the field after undergoing pressure, sealing, and functional tests. Drive and control systems are selected based on operational safety and ease of use, aiming for long-lasting solutions with low maintenance requirements. Thanks to Enermak's strong manufacturing infrastructure and field experience, reliable, efficient, and sustainable valve solutions are offered for dam and HEPP projects.
