Procontrol - Intelligent Design Needle Valve
Procontrol - Intelligent Design Needle Valve
Procontrol - Intelligent Design Needle Valve
In many cases, to regulate the flow, the only thing we can adjust is the section area of the valve passage, which can be called throttling. Although it might sound easy, but throttling is a very difficult task, as water wants to keep the same flow rate through the throttled zone, which causes local water jets and cavitation.
Coping with such extreme conditions needs a high-tech designed anti-cavitation valve. Inline version of this premium valve type is called needle valve.
In many cases, to regulate the flow, the only thing we can adjust is the section area of the valve passage, which can be called throttling. Although it might sound easy, but throttling is a very difficult task, as water wants to keep the same flow rate through the throttled zone, which causes local water jets and cavitation.
Coping with such extreme conditions needs a high-tech designed anti-cavitation valve. Inline version of this premium valve type is called needle valve.
In many cases, to regulate the flow, the only thing we can adjust is the section area of the valve passage, which can be called throttling. Although it might sound easy, but throttling is a very difficult task, as water wants to keep the same flow rate through the throttled zone, which causes local water jets and cavitation.
Coping with such extreme conditions needs a high-tech designed anti-cavitation valve. Inline version of this premium valve type is called needle valve.
Advantages
Intelligent Design Needle Valve
All needle valves work according to the following principle: Flow is directed to outer part first and then it is directed to center through the throttling zone. This enables the zone affected by cavitation to be kept in the centre of the pipeline, and eliminates material damage. The valve works according to the same principle, however, we have improved the design in several areas. Similar to other needle valves, It has a balanced piston for throttling, and all such pistons have two open ends, which need to be sealed in front and back, when you shall close the valve. The valve has its front seal in protected zone, where there is zero effect of water jets and cavitation, while on other designs the front seal is the weakest point. In conventional designs, the piston is either fully guided or in front and back, and this causes possible blockage of piston due to foreign materials, which can get trapped at guiding face area. The valve is designed according to latest trend, which is stripped guide design. In this design, there are several rib style result and piston never gets blocked by foreign object. The anti-cavitation throttling trim (slotted cage, perforated cage or other) is easy replaceable.
Intelligent Design Needle Valve
All needle valves work according to the following principle: Flow is directed to outer part first and then it is directed to center through the throttling zone. This enables the zone affected by cavitation to be kept in the centre of the pipeline, and eliminates material damage. The valve works according to the same principle, however, we have improved the design in several areas. Similar to other needle valves, It has a balanced piston for throttling, and all such pistons have two open ends, which need to be sealed in front and back, when you shall close the valve. The valve has its front seal in protected zone, where there is zero effect of water jets and cavitation, while on other designs the front seal is the weakest point. In conventional designs, the piston is either fully guided or in front and back, and this causes possible blockage of piston due to foreign materials, which can get trapped at guiding face area. The valve is designed according to latest trend, which is stripped guide design. In this design, there are several rib style result and piston never gets blocked by foreign object. The anti-cavitation throttling trim (slotted cage, perforated cage or other) is easy replaceable.
Intelligent Design Needle Valve
All needle valves work according to the following principle: Flow is directed to outer part first and then it is directed to center through the throttling zone. This enables the zone affected by cavitation to be kept in the centre of the pipeline, and eliminates material damage. The valve works according to the same principle, however, we have improved the design in several areas. Similar to other needle valves, It has a balanced piston for throttling, and all such pistons have two open ends, which need to be sealed in front and back, when you shall close the valve. The valve has its front seal in protected zone, where there is zero effect of water jets and cavitation, while on other designs the front seal is the weakest point. In conventional designs, the piston is either fully guided or in front and back, and this causes possible blockage of piston due to foreign materials, which can get trapped at guiding face area. The valve is designed according to latest trend, which is stripped guide design. In this design, there are several rib style result and piston never gets blocked by foreign object. The anti-cavitation throttling trim (slotted cage, perforated cage or other) is easy replaceable.
Material Selection
The valve has a robust single piece cast housing in ductile iron as standard. Other materials are available on request. All critical parts are in AISI 316 Stainless Steel (constructed or cast) including the main slotted body piece, which is the best anti-cavitation and erosion material. Only bush bearing systems are made of copper alloys, and all those are out of cavitation and water jet zone. Bronze or gunmetal cast parts are porous in microstructure. This is the main reason why they are used as bush and bearing elements in industry with ‘self lubricated’ adjective. Those pores inside their structure are good for absorbing water or oil in their body and use as lubricant versus stainless shafts moving. Those pores in microstructure are a very important disadvantage against cavitation conditions. Thus we strongly avoid using any GUNMETAL or BRONZE ENERGY DISSIPATING elements in our designs. Rubber seals are EPDM and retainer bolts are A4.
Material Selection
The valve has a robust single piece cast housing in ductile iron as standard. Other materials are available on request. All critical parts are in AISI 316 Stainless Steel (constructed or cast) including the main slotted body piece, which is the best anti-cavitation and erosion material. Only bush bearing systems are made of copper alloys, and all those are out of cavitation and water jet zone. Bronze or gunmetal cast parts are porous in microstructure. This is the main reason why they are used as bush and bearing elements in industry with ‘self lubricated’ adjective. Those pores inside their structure are good for absorbing water or oil in their body and use as lubricant versus stainless shafts moving. Those pores in microstructure are a very important disadvantage against cavitation conditions. Thus we strongly avoid using any GUNMETAL or BRONZE ENERGY DISSIPATING elements in our designs. Rubber seals are EPDM and retainer bolts are A4.
Material Selection
The valve has a robust single piece cast housing in ductile iron as standard. Other materials are available on request. All critical parts are in AISI 316 Stainless Steel (constructed or cast) including the main slotted body piece, which is the best anti-cavitation and erosion material. Only bush bearing systems are made of copper alloys, and all those are out of cavitation and water jet zone. Bronze or gunmetal cast parts are porous in microstructure. This is the main reason why they are used as bush and bearing elements in industry with ‘self lubricated’ adjective. Those pores inside their structure are good for absorbing water or oil in their body and use as lubricant versus stainless shafts moving. Those pores in microstructure are a very important disadvantage against cavitation conditions. Thus we strongly avoid using any GUNMETAL or BRONZE ENERGY DISSIPATING elements in our designs. Rubber seals are EPDM and retainer bolts are A4.
Valve Sizing
Nominal flow rate is the main factor of pipeline sizing. Most common valve types used to have same nominal diameter as the pipe nominal diameter.
Nominal flow rate is the main factor of pipeline sizing. Most common valve types used to have same nominal diameter as the pipe nominal diameter.
Nominal flow rate is the main factor of pipeline sizing. Most common valve types used to have same nominal diameter as the pipe nominal diameter.
Needle valves work on special duty and in general have a duty of throttling. By this reason needle valve sizes are determined based on working conditions and this may result in a smaller needle valve than pipeline diameter. Such small size NV's are coupled with proper reducers to fit into main line.
Needle valves work on special duty and in general have a duty of throttling. By this reason needle valve sizes are determined based on working conditions and this may result in a smaller needle valve than pipeline diameter. Such small size NV's are coupled with proper reducers to fit into main line.
Needle valves work on special duty and in general have a duty of throttling. By this reason needle valve sizes are determined based on working conditions and this may result in a smaller needle valve than pipeline diameter. Such small size NV's are coupled with proper reducers to fit into main line.
This solution can in some cases be more economical than using reducers. We decide the needle valve size in such a way that the maximum flow required is available at minimum differential pressure given when the valve is almost fully open. The maximum differential minimum flow requirement is achieved at minimum suitable open stroke. If the valve is sized too large, most part of the valve stroke will never be used and this may cause limited regulation behaviour and faster wear of the anti-cavitation trim.
This solution can in some cases be more economical than using reducers. We decide the needle valve size in such a way that the maximum flow required is available at minimum differential pressure given when the valve is almost fully open. The maximum differential minimum flow requirement is achieved at minimum suitable open stroke. If the valve is sized too large, most part of the valve stroke will never be used and this may cause limited regulation behaviour and faster wear of the anti-cavitation trim.
This solution can in some cases be more economical than using reducers. We decide the needle valve size in such a way that the maximum flow required is available at minimum differential pressure given when the valve is almost fully open. The maximum differential minimum flow requirement is achieved at minimum suitable open stroke. If the valve is sized too large, most part of the valve stroke will never be used and this may cause limited regulation behaviour and faster wear of the anti-cavitation trim.
To size the valve to main pipeline DN with a tailor designed trim is the best option, but can be found costly compared with reduction of the size. Attached is the basic chart for standard trim needle valves.
To size the valve to main pipeline DN with a tailor designed trim is the best option, but can be found costly compared with reduction of the size. Attached is the basic chart for standard trim needle valves.
To size the valve to main pipeline DN with a tailor designed trim is the best option, but can be found costly compared with reduction of the size. Attached is the basic chart for standard trim needle valves.
We recommend a straight pipeline section up to 5–10 x DN downstream of the valve. There be no fittings or valves in this zone.
We recommend a straight pipeline section up to 5–10 x DN downstream of the valve. There be no fittings or valves in this zone.
We recommend a straight pipeline section up to 5–10 x DN downstream of the valve. There be no fittings or valves in this zone.
Turn Your Valve Requirements Into Reality—Today.
From design to delivery, we craft will help you craft valve solutions engineered for maximum efficiency and durability.
Avishkar Engineers Pvt Ltd
At Avishkar Valves, we manufacture high-quality industrial valves that keep your operations running. Strong. Durable. Built for performance.
Turn Your Valve Requirements Into Reality—Today.
From design to delivery, we craft will help you craft valve solutions engineered for maximum efficiency and durability.
Avishkar Engineers Pvt Ltd
At Avishkar Valves, we manufacture high-quality industrial valves that keep your operations running. Strong. Durable. Built for performance.
Turn Your Valve Requirements Into Reality—Today.
From design to delivery, we craft will help you craft valve solutions engineered for maximum efficiency and durability.
Avishkar Engineers Pvt Ltd
At Avishkar Valves, we manufacture high-quality industrial valves that keep your operations running. Strong. Durable. Built for performance.
