Frequently Asked Questions (FAQ)
Butterfly Valve
1) Wafer butterfly valves are designed to fit between flanges and are commonly used in general-purpose applications.
2) Lug butterfly valves have threaded lugs, allowing installation at the end of a pipeline and easier maintenance.
2) Lug butterfly valves have threaded lugs, allowing installation at the end of a pipeline and easier maintenance.
Common seat materials include EPDM, NBR, PTFE, and metal seat.
EPDM is typically used for water services, NBR for oil / diesel, PTFE offers better chemical resistance, and metal seats are suitable for high-temperature or abrasive applications.
EPDM is typically used for water services, NBR for oil / diesel, PTFE offers better chemical resistance, and metal seats are suitable for high-temperature or abrasive applications.
Yes.
Most butterfly valves can be automated using pneumatic actuators with ISO 5211 mounting standards.
VD Valve supplies both manual and automated butterfly valve assemblies based on application requirements.
Most butterfly valves can be automated using pneumatic actuators with ISO 5211 mounting standards.
VD Valve supplies both manual and automated butterfly valve assemblies based on application requirements.
Valve size is usually selected based on pipeline size and required flow rate.
Proper sizing helps ensure efficient flow control and prevents excessive pressure loss.
You may contact us for sizing if required.
Proper sizing helps ensure efficient flow control and prevents excessive pressure loss.
You may contact us for sizing if required.
Ball Valve
1-piece ball valves have reduced bore and are often cheaper.
2-piece ball valves are full bore, compact, and suitable for standard shut-off applications.
3-piece ball valves are full bore too, and it allow easier maintenance and cleaning without removing the valve from the pipeline.
2-piece ball valves are full bore, compact, and suitable for standard shut-off applications.
3-piece ball valves are full bore too, and it allow easier maintenance and cleaning without removing the valve from the pipeline.
Ball valves are commonly available in cast iron, stainless steel, carbon steel, brass, and PVC.
Material selection depends on pressure, temperature, and media compatibility.
Not sure? Consult VD Valve for expert advice.
Material selection depends on pressure, temperature, and media compatibility.
Not sure? Consult VD Valve for expert advice.
Yes. Ball valves with ISO 5211 mounting pads can be automated using pneumatic or electric actuators.
VD Valve provides complete automated ball valve packages upon request.
VD Valve provides complete automated ball valve packages upon request.
Full bore ball valves have an internal diameter equal to the pipe size, resulting in minimal pressure drop.
Reduced bore valves have a smaller internal opening and are generally more cost-effective.
Reduced bore valves have a smaller internal opening and are generally more cost-effective.
Gate Valve
Gate valves are used for full open or full close isolation in pipelines where minimal pressure drop is required.
No. Gate valves are not designed for flow regulation and may be damaged if partially open.
In a rising stem gate valve, the stem is typically outside the fluid path, reducing exposure to the process media. It also giving a clear visual indication of valve position (stem moving up when opening & vice versa) but requiring more vertical space.
In a non-rising stem gate valve, the stem threads are inside the valve body and are in direct contact with the fluid. It suitable for limited-space or underground installations, though valve position is not visually visible.
In a non-rising stem gate valve, the stem threads are inside the valve body and are in direct contact with the fluid. It suitable for limited-space or underground installations, though valve position is not visually visible.
Gate valves are commonly manufactured in cast iron, ductile iron, forge steel, carbon steel, and stainless steel.
VD Valve can assist in selecting the suitable gate valve based on media and operating conditions.
VD Valve can assist in selecting the suitable gate valve based on media and operating conditions.
Globe Valve
Globe valves are used for flow regulation and throttling in pipelines.
Due to their internal flow path design, which changes flow direction.
However, proper sizing based on Cv value and flow rate will helps minimize pressure loss.
Consult VD Valve if assistance is needed.
However, proper sizing based on Cv value and flow rate will helps minimize pressure loss.
Consult VD Valve if assistance is needed.
Yes. Globe valves are well suited for applications requiring frequent adjustment.
They are commonly used in steam lines, water systems, and process control applications because their linear stem movement and seat design provide precise and stable flow regulation.
VD Valve can recommend suitable globe valve designs based on application requirements.
VD Valve can recommend suitable globe valve designs based on application requirements.
Check Valve
Check valves prevent backflow and protect pumps and equipment from reverse flow damage.
VD Valve supplies check valves for water, industrial, and process pipelines.
VD Valve supplies check valves for water, industrial, and process pipelines.
Common types include swing check, lift check, dual plate, and spring-loaded check valves.
No. Check valves operate automatically based on flow direction.
They are typically installed at pump outlets and critical pipeline sections.
VD Valve can assist in selecting the appropriate check valve type for system protection.
VD Valve can assist in selecting the appropriate check valve type for system protection.
Knife Gate Valve
Knife gate valves are designed for slurry, viscous, or solid-containing media.
Yes, especially in wastewater or low-pressure water systems.
Yes. They can be equipped with pneumatic or electric actuators.
Wastewater treatment, pulp & paper, and mining industries.
VD Valve can provide both manual and automated knife gate valve solutions.
VD Valve can provide both manual and automated knife gate valve solutions.
Safety Valve
Safety valves protect systems from overpressure by automatically releasing excess pressure.
Yes. It opens automatically when the preset pressure is exceeded.
Yes. Accurate setting and periodic calibration are critical for safety.
On boilers, pressure vessels, and pressurized pipelines.
VD Valve can assist in selecting safety valves based on pressure and application requirements.
VD Valve can assist in selecting safety valves based on pressure and application requirements.
