Pilot operated flow control valve

NegotiableUpdate on 02/05

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Nature of the Manufacturer: Producers

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Overview

The 400X ductile iron A-type pilot controlled flow control valve is a multifunctional valve that uses high-precision pilot control to control flow. It is suitable for pipelines that require flow and pressure control in water distribution pipes. It maintains a predetermined flow rate, limits excessive flow to a predetermined value, and appropriately reduces upstream high pressure. Even if the pressure upstream of the main valve changes, it will not affect the flow downstream of the main valve.

Product Details

Main Features

1. Pilot controlled structureThe design adopts a pilot valve to control the action of the main valve, and uses a small flow pilot valve to drive the piston to adjust the overcurrent area of the main valve throttling part, achieving precise adjustment and dynamic balance of the outlet flow. Compared to conventional throttle valves that use orifice plates or purely mechanical methods to reduce the drainage area, the use of related pilot valves can minimize energy loss during the throttling process.

2. Self control without the need for external energyDriven by the pressure of the medium itself, without the need for electricity or control systems, the main valve opening is controlled and regulated through hydraulic automatic operation to maintain a constant flow rate through the main valve. Easy maintenance, stable flow control, and long service life.

3. High precision flow controlBy rotating the adjustment screw, the outlet flow rate can be continuously adjusted with high precision. When the inlet pressure varies between 0.8 times the nominal pressure and one time the nominal pressure, the deviation of the outlet flow rate change is ≤ ± 8% -12% of the set value, with high control sensitivity and easy debugging.

4. High quality ductile iron materialThe valve body is made of ductile iron material, which has excellent mechanical properties and corrosion resistance. The valve seat and disc are made of copper alloy, the sealing ring is made of nitrile rubber, the valve stem is made of 2Cr13 stainless steel, and the spring is made of 50CrVA. The overall structure is durable and reliable.

5. Compact structure with low flow resistanceAdopting a full channel, streamlined design, with low fluid resistance and high flow rate. The valve body, piston cylinder, and piston have dual guidance, ensuring smooth and reliable operation. The connection between the body cover and the piston cylinder is double sealed by a sealing gasket and a sealing ring, with no external leakage.

6. Security protection mechanismIn case of emergency, traffic can be cut off to avoid losses. Built in micro filter to prevent impurities from blocking the pilot valve pipeline. The combination of all stainless steel piston cylinder, integral cast piston, and NBR sealing ring greatly extends the service life.

Technical Specifications

parameter category	Technical Specifications
Nominal Pressure	1.0-2.5MPa
Shell test pressure	1.5-3.75MPa
Sealing test pressure	1.1-2.75MPa
inlet pressure	1.0-2.5MPa
Adjustable export pressure	0.09-1.6MPa
Applicable Medium	water
medium temperature	0-80℃
Nominal Diameter	DN25-DN800mm
Valve body material	ductile cast iron
valve seat material	copper alloy
sealing material	Nitrile rubber
Valve stem material	2Cr13 stainless steel
Spring material	50CrVA

working principle

When the valve supplies water from the inlet end, water flows through the needle valve into the main valve control chamber, and flows out of the main valve control chamber to the outlet through the pilot valve and ball valve. At this time, the main valve is in a fully open or floating state. The flow control valve on the upper part of the main valve can be set to a certain opening degree. By adjusting the needle valve opening and the pressure of the pilot valve spring, the main valve opening can be kept at the set opening, and the pilot valve will automatically adjust when the pressure changes to maintain the same flow rate.

Application field

400X ductile iron type APilot operated flow control valveWidely used in water supply network systems such as high-rise buildings and living areas, as well as urban water supply projects, it is particularly suitable for pipeline systems such as water supply, fire protection, and air conditioning that require precise flow control, maintaining stable system flow and improving equipment operating efficiency.

Ordering Instructions

When calling for inquiries or orders, please indicate the product type, application location, material, nominal diameter, nominal pressure, working medium, working pressure difference, medium temperature, power supply voltage and power parameters so that we can correctly select and quote for you.

Yongjia Gongao Valve Co., Ltd