Fluid Tech Water valves are critical equipment in pipeline systems for water supply, drainage, fire protection, etc., used to control the direction, pressure, and flow of water. Understanding valve’s characteristics is essential for the design, construction, operation, and maintenance of pipeline systems.
Valve Classification Methods:
By Function: Isolation valves (e.g., Gate Valve, Ball Valve), Regulating valves (e.g., Globe Valve, Butterfly Valve), Check Valve, Safety Valve, etc.
By Actuation Method: Manual Valve, Electric Actuated Valve, Pneumatic Actuated Valve, Hydraulic Actuated Valve.
By Connection Type: Flanged Connection, Threaded Connection, Wafer Type (Butt-welded for some), Grooved Connection, Welded.
Introductions to Common Water Valves:
Function: An isolation valve designed for full open or full close operation, primarily used to shut off or connect water flow in a pipeline. It is not suitable for flow regulation.
Working Principle: Rotating the hand wheel moves the gate (wedge or parallel type) vertically up and down within the valve body to achieve opening and closing.
Advantages:Low Flow Resistance: When fully open, the flow passage is straight, offering almost zero flow resistance.Good Sealing: Closing involves relative sliding of seal faces, minimizing erosion.Bidirectional Flow: Medium can flow in from either side.
Disadvantages:High Operating Torque, Slow Speed: Requires many turns to fully open or close. Large Dimensions and Installation Space: The structure has a significant height.Seal Faces Prone to Damage: Relative friction between the gate and seat seal faces during closing can cause damage. For large-size gate valves, installing a turbine actuator solves this issue.
Application Scenarios: Primarily used in main water supply pipelines, pump station outlets, and situations requiring complete shutoff with infrequent operation. Typically used in larger diameters (DN50 and above).
2.Fluid Tech Butterfly Valve
Function: Can be used for shutoff and connection, as well as for flow regulation. Very versatile.
Working Principle: A disc-shaped butterfly plate is rotated 90° around the valve stem via a handle or worm gear drive to open, close, or regulate.
Advantages:Rapid Operation: Just a 90° rotation to open or close. Compact, Lightweight, Space-Saving: Much smaller than gate valves of the same diameter. Low Cost. Good Regulation Performance: Flow can be controlled effectively by adjusting the opening angle of the disc.
Disadvantages: Relatively High Flow Resistance: The disc is always in the flow path, causing some obstruction. Sealing Performance Slightly Inferior to gate valves (especially under high pressure), though soft-sealed butterfly valves offer excellent sealing. Unsuitable for Media with High Particulate Content, which can wear the seal.
Application Scenarios: One of the most widely used water valves. Commonly used in municipal water supply and drainage, fire protection systems, circulating water systems, and applications requiring quick operation and limited space.
3.Fluid Tech Ball Valve
Function: Rapid shutoff and connection, can also be used for regulation (V-port ball valve).
Working Principle: Uses a ball with a central bore as the closure member. Rotating the ball 90° controls the flow passage.
Advantages: Very Low Flow Resistance (second only to gate valves): Full-bore ball valves have a flow path nearly equal to the pipe diameter. Extremely Quick and Easy Operation: Requires only a 90° turn. Excellent Sealing: Advanced sealing materials ensure high reliability. High Reliability, long service life.
Disadvantages: Unsuitable for Throttling (standard O-type ball valve). Relatively High Cost.
Application Scenarios: Primarily used where quick shutoff and tight sealing are required, such as household service lines, instrument isolation, and shutoff valves before precision equipment. Holds a significant advantage in small diameters (below DN50).
4.Fluid Tech Globe Valve
Function: Primarily used for regulating flow and shutoff. Its regulating performance is superior to gate and ball valves.
Working Principle: Rotating the hand wheel moves the disc (plug) vertically along the seat axis, changing the flow area for regulation and shutoff.
Advantages: High Regulation Accuracy: Good linear relationship between stem travel and flow rate, allowing precise control. Good Sealing, easy maintenance. Short Stroke, fast opening/closing time.
Disadvantages: Very High Flow Resistance: The “S” shaped flow path causes significant pressure drop. High Operating Torque. Flow Direction Requirement: Must be installed with “low pressure inlet, high pressure outlet” – indicated by an arrow on the body.
Application Scenarios: Situations requiring precise flow or pressure control, such as pump houses, boiler feed water, chemical dosing systems, etc. Not suitable for viscous or particle-laden media.
5.Fluid Tech Check Valve (Non-Return Valve)
Function: Prevents back flow of media; also called a one-way valve.
Working Principle: Automatically opens and closes based on the force of the media flow itself.
Common Types:
Swing Check Valve: The disc swings on a hinge pin outside the seat. Suitable for large diameters and low flow velocities.
Lift Check Valve: The disc lifts vertically along the seat axis. Good sealing but higher flow resistance; suitable for high pressure, small diameters (e.g., pump discharge).
Wafer Check Valve (Silent Check Valve): Very compact structure, quick operation, effectively prevents water hammer and noise.
Application Scenarios: Pump discharge and locations where system pressure reversal must be prevented. An essential protective device in any pumping system.
6.Fluid Tech Pressure Reducing Valve (PRV)
Function: Reduces the inlet pressure and stabilizes it at a required outlet pressure, automatically adjusting regardless of changes in inlet pressure or flow.
Working Principle: Senses the outlet pressure and automatically adjusts the disc opening to dissipate excess energy, maintaining a constant outlet pressure.
Application Scenarios: Water supply in high-rise buildings (to prevent over-pressure in lower zones), fire protection systems (to stabilize sprinkler operating pressure), district pressure control.
7.Fluid Tech Air Release Valve
Function: Removes air accumulated in pipelines to ensure efficient water transmission and prevent air locks and water hammer.
Working Principle: When air is present, a float drops, opening the valve to vent air. When water fills the valve, the float rises and closes the valve.
Application Scenarios: Installed at high points and local high points in water transmission pipelines.
8.Fluid Tech Y Strainer
A Y Strainer, commonly known as a Y-type filter or Y-type dirt separator, derives its name from its valve body’s resemblance to the letter “Y”. It is a simple, efficient, and reliable filtering device in pipeline systems. Its primary function is to filter and remove solid particles, impurities, debris, and rust carried by fluids (such as water, oil, steam, gas, etc.) through a metal strainer mesh, thereby protecting downstream critical equipment from damage or clogging.
Valve Function: The core purpose of a Y-Strainer is protection. It is typically installed upstream (inlet side) of equipment such as pumps, flow meters, control valves (e.g., pressure reducing valves, thermostatic control valves), steam traps, spray nozzles, and heat exchangers. By intercepting impurities in advance, the Y Strainer prevents equipment wear, seizure, and corrosion, ensures the accuracy of measurement instruments, maintains system efficiency and stability, and reduces unplanned downtime and maintenance costs.
Basic Principles for Valve Selection:
1. Valve Function First: Determine if the primary need is shutoff, regulation, prevention of back flow, or another function.
2. Consider Operating Conditions: Including pressure rating, temperature, media (clean water, wastewater, etc.).
3. Valve Size and Connection Type: Must match the pipeline dimensions and interface form.