Pilot operated pressure reducing valve made of carbon steel

NegotiableUpdate on 02/05

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Nature of the Manufacturer: Producers

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Overview

DR20-4-5B/200YM is a pressure reducing valve with a pilot control structure, mainly used to reduce the pressure of a certain circuit in the hydraulic system and keep it constant. This valve consists of two parts: a main valve and a pilot valve. The pilot valve senses changes in outlet pressure, controls the action of the main valve, and achieves precise pressure regulation function.

Product Details

Main Features

1. Pilot control 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 pressure. Compared with ordinary spring direct acting pressure reducing valves, it has the advantages of smoother pressure regulation, less influence of flow rate changes on outlet pressure, and faster dynamic response.

2. Automatic voltage stabilization functionDriven by the pressure of the medium itself, without the need for electricity or control systems, the valve core opening is automatically adjusted through diaphragm sensing of outlet pressure changes, achieving automatic operation of 'high pressure inlet and low pressure outlet'. When the outlet pressure increases, the diaphragm pushes the valve core to close and reduce the flow rate; When the pressure drops, the spring resets and opens the valve to replenish the medium, and the entire process is continuous, automatic, and without delay.

3. High precision adjustmentBy rotating the adjusting screw, the outlet pressure can be continuously adjusted, and the segmented design of the adjusting spring ensures high adjustment accuracy. The pilot valve is equipped with a pressure gauge interface, which facilitates real-time monitoring of inlet and outlet pressures and improves operational safety.

4. Excellent sealing performanceThe main valve core and guide valve core are sealed with rubber or polytetrafluoroethylene soft seal, which has good sealing performance and can reduce dynamic and static pressure. The valve body, valve cover, and bottom cover are made of WCB cast steel material, while the valve seat and disc are made of 2Cr13 stainless steel, which has good corrosion resistance and wear resistance.

5. Security protection mechanismBuilt in safety pressure relief device, when the outlet pressure rises abnormally, the pressure relief hole automatically exhausts to prevent overpressure; Using corrosion-resistant rubber or fluororubber membrane, it is tightly sealed to prevent leakage; Compact and durable structure, the main material is corrosion-resistant, wear-resistant, and has a long service life.

Technical Specifications

parameter category	Technical Specifications
Nominal Pressure	31.5MPa
Shell test pressure	47.25MPa
Sealing test pressure	31.5MPa
inlet pressure	31.5MPa
Export pressure range	0.1-5.0MPa
Minimum pressure difference	0.15MPa
Operating Temperature	-30~80 ℃ (nitrile rubber) -20~80 ℃ (fluororubber)
Applicable Medium	Mineral oil (DIN51524), phosphate ester (IID-R)
Viscosity range	10×10 ⁻⁶~800×10⁻⁶ m²/s
filtration accuracy	NAS1638 Level 9
maximum flow	300 L/min (base plate installation)
connection method	threaded connection
Nominal Diameter	DN20mm

Main component materials

Part Name	material
Valve body, valve cover, bottom cover	WCB cast steel
Valve seat, valve disc	2Cr13/304 stainless steel
cylinder liner	2Cr13/25 (hard chrome plating)/304
piston	2Cr13/copper alloy
piston ring	Alloy cast iron/para polystyrene
Guide valve seat, guide valve stem	2Cr13/304 stainless steel
diaphragm	1Cr18Ni9Ti stainless steel
Main valve spring	50CrVA
adjust the spring	60Si2Mn
Sealing gasket (X/F model)	Rubber/PTFE

working principle

The DR20-4-5B/200YM pilot operated pressure reducing valve operates on the principle of pilot control. When the outlet pressure exceeds the set pressure, the diaphragm compression regulating spring is pushed, and the pilot valve gradually closes. The medium flowing into the upper part of the piston decreases, and the piston rises, causing the main valve disc to gradually close under the action of the main valve spring. The medium flowing from chamber A to chamber B decreases, and the pressure behind the valve decreases. The slight changes in pressure behind the valve affect the balance between the diaphragm and the regulating spring, causing the diaphragm to move up and down, pushing the pilot valve and piston to work, and controlling the flow of the medium by moving the main valve up and down, thereby maintaining stable pressure behind the valve.

Application field

DR20-4-5B/200YM pilot operated pressure reducing valve is widely used in hydraulic systems in industries such as petrochemicals, power, metallurgy, and machinery manufacturing. It is particularly suitable for situations where high-pressure oil needs to be reduced to medium and low-pressure circuits, such as hydraulic control systems in hydraulic stations, injection molding machines, die-casting machines, engineering machinery, and other equipment.

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