• 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 20
11 22 33 44 55 66 77 88 99 1010 1111 1212 1313 1414 1515 1616 1717 1818 1919 2020 2120
 

  PRESSURE REGULATING VALVE (DOWNSTREAM) SERIES- MIC- 711

INTRODUCTION

Downstream Pressure regulating valve is self contained, self Operated control devices, maintain a desired reduced outlet pressure, while providing the required fluid flow to satisfy a variable downstream demand. The valve at which the reduced pressure is maintained is the outlet pressure setting of the regulator. It utilizes energy from the controlled system. The pressure reducing regulators are manufactured in a variety to manage downstream system pressures in low, medium, high flow applications; model features a diaphragm /piston type or combination of both to suit different applications.

DIRECT OPERATED VALVE- MIC-721 STEAM PRV WITH CONDENSATE
CHAMBER MIC- 731
DIRECT OPERATED BALANCE
DESIGN VALVE-MIC- 741
direct-operated-valve-mic-721 steam-prv-with-condensate-chamber-mic-731 direct-operated-balance-design-valve-mic-741

  FEATURES :

  • Reduces higher inlet pressure to a constant lower Outlet
    pressure.
  • Outlet pressure is accurate over wide range of flow.
  • Pilot-operated main valve is not subject to pressure fall off
    Characteristic of direct-acting PRV’s.
  • Outlet pressure is adjustable over complete range of control spring.

  PRINCIPLE OF OPERATION :

  All type of regulators generally fit into one of the following two basic categories.
  1) Direct Operated
  2) Pilot Operated
  The specific considerations peculiar to your control needs is to be carefully studied and understood to determine which method of control is the better choice. Regulators when compared to control Valve / Instrument package have their advantages and limitations.   Table No.2 lists selected characteristic of both.

 

The operational principal of both types of regulators is explained as follows.

A) DIRECT OPERATED

 

In operation, a direct-operated, pressure reducing regulator senses the downstream pressure through either internal pressure registration or an external control line. This downstream pressure opposes a spring which moves the diaphragm and valve plug to change the size of the flow path through the regulator. Characteristically direct operator regulator are adequate for narrow-range control, and where the allowable change in output pressure can be 10 to 20% of the outlet pressure setting. This 10 to 20% is typical although finer control can be achieved depending on the specific application requirement.




direct-operated
 

 B) PILOT OPERATED

A pilot-operated system uses a two-path control. In two path control,the main valve diaphragm responds quickly to downstream pressure changes, causing an immediate correction in the main valve position. At the same time, the pilot diaphragm diverts some of the reduced inlet pressure to the other side of the valve diaphragm, which controls the final positioning of the main valve plug.Two-path controls result in fast response. Pilot-operated regulators are preferred fo broad range control, or where the allowable change in outlet pressure is required to be less than 10 percent of the outlet
pressure setting. They are also commonly used when remote set point adjustment is required for a regulator application.

 

Pilot-operated

Pilot-operated-valve-mic-751

 

 

DESIGN FEATURES :

  • Operates automatically off line pressure.
  • Heavy-duty, nylon-reinforced diaphragm.
  • Round-shaped, soft seat seal provides drip-tight class VI closure.
  • Diaphragm assembly guided top and bottom.
  • Throttling seat retainer for flow and pressure stability.
  • Easily maintained without removal from the line.
  • Pressure adjustment by single adjusting screw.
  • Replaceable seat ring.
  • Range of body & diaphragm material combinations to meet majority of requirements.
  • IBR certification in Form III C available.
  • Designed ruggedly to withstand shocks.
  • Simple and economic design.

QUALITY AND PERFORMANCE GUARANTEE :

  • Produced with Quality Systems accredited to ISO 9001: 2008 by Bureau Veritas.
  • Full material certification available for all major component Parts.
  • Full guarantee on design and Performance.
  • All testing performed to the requirements of ANSI B16.34.

VALVE SIZING CO-EFFICIENT Cv RATING. (Table 1)

VALVE SIZE
Inch
1/2 3/4 1 1 1/2 2 3 4 6 8 10 12
mm
15
20
25
40
50
80
100
150
200
250
300
Pressure
Deviation
(Kg/cm²)
0.3
0.7
0.3
0.7
0.3
0.7
0.3
0.7
0.3
0.7
1.7
1.7
2.0
2.0
2.5
2.5
Cv Value
2
4
4
5
5
9
12
12
18
15
50
80
200
300
450
650

 

REGULATOR vs. CONTROL VALVE WITH INSTRUMENTION (Table 2)

Selected Regulator Characteristic
Selected Control Valve/Instrument Characteristic
  • Purchase price, installation and maintenance costs are normally lower.
  • Requires no additional power sources
    for basic operation
  • Less complex, and often lighter and
    more compact.
  • Controller, which provides fixed-band
    proportional control only, is built in
  • Wide variety of construction material
    and accessories available.
  • Transmitting and controlling
    instruments are separate and may be
    remote mounted.
  • Specific construction has broad
    application flexibility.
  • Separate controller allows for
    adjustable-band proportional control
    with reset and/or rate optional for
    excellent control response.

 

GUIDELINES ON OPERATION & INSTALATION :

  • All regulators should be installed and used in accordance with applicable standard and localcodes and regulations.
  • Adequate overpressure protection should be installed to protect the regulator from overpressure. Adequate overpressure protection should also be installed to protect all downstream equipment in the event of regulator failure.
  • Downstream pressures significantly higher than the regulator's pressure setting may damage soft seats and other internal parts.
  • The recommended selection for orifice diameters is the smallest orifice that will handle the flow.
  • Regulator body size should never be larger than the pipe size. In many cases, the regulator body is one size smaller than the pipe size.
  • When adjusting set point, the regulator should be flowing at least five percent of the normal operating flow.
  • Direct-operated regulators generally have faster response to quick flow changes than pilot operated regulators.
  • Droop is the reduction of outlet pressure experienced by pressure-reducing regulators as the flow rate increases. It is stated as a percent, in inches of water column (mbar) or in pounds per
    square inch (bar) and indicates the difference between the outlet pressure setting made at low flow rates and the actual outlet pressure at the published maximum flow rate. Droop is also
    called offset or proportional band.
  • Downstream pressure always changes to some extent when inlet pressure changes.
  • Most soft-seated regulators will maintain the pressure within reasonable limits down to zero flow. Therefore, a regulator sized for a high flow rate will usually have a turndown ratio
    sufficient to handle pilot-light loads during off cycles.
  • Diaphragms leak a small amount due to migration of gas through the diaphragm material. To allow escape of this gas, be sure casing vents (where provided) remain open.
  • A disk with a cut appearance probably means you had an overpressure situation. Thus, investigate further.
  • When using relief valves, be sure to remember that the reset point is lower than the start-to bubble point. To avoid seepage, keep the relief valve set point far enough above the regulator set
    point.
  • Vents should be pointed down to help avoid the accumulation of water condensation or other materials in the spring case.
  • Make control line connections in a straight run of pipe about 10 pipe diameters downstream of any area of turbulence, such as elbows, pipe swages, or block valves.
  • Do not use needle valves in control lines; use full – open valves. Needle valves can cause instability.
 
 
 
PH Sensor   I   PH Electrode   I   Industrial Dip   I   Industrial PH Sensor   I   Sterilizable PH Sensor   I   Online PH Indicator / Controller / Transmitter   I   PH Meter   I   
PH Bench Meter With 0.001 Resolution and Stability Indicator   I   Slim PH Meter   I   
Conductivity Sensor   
I   Conductivity Sensors   I   Conductivity Sensor - Industrial Pipeline   I   Conductivity Sensor - Industrial Dip   I   Sanitary Conductivity Sensor   I   Conductivity Indicating Controller Cum Transmitter   I   Conductivity Meter   I   Multi-ranging Conductivity, TDS, NaCl, Temperature Meter   I   Multi - Ranging Conductivity Meter   I   Dissolved Oxygen Sensors   IGalvanic-Maintenance Free DO2 Electrode  I   Polarographic DO2 Electrode   I   MicroSet DO Sensor   I   DO ( Dissolved Oxygen ) Meter   I   Dissolved Oxygen Meter   I   Table Top Dissolved Oxygen Meter   I   Portable Dissolved Oxygen Meter   I   Ultrasonic Level Transmitter   I   Electromagnetic Flow Meter   I   PH Transmitters   I   On-line Panel Mounted PH Indicator cum Transmitter   I   Online PH Transmitter   I   Oxidation Reduction Potential   I   Oxidation Reduction Potential Sensor (I) – ( ORP Sensor )   I   Oxidation Reduction Potential Sensor – ( ORP Sensor )   I   Online Oxidation Reduction Potential Indicator, Controller and Transmitter   I  Oxidation Reduction Potential Transmitters - ( ORP Transmitters )   I   Ozone Amperometric Sensors   I   Dissolved Chlorine Sensors   I  TDS Indicating Controller   I   Magnetic Flowmeter   I   Dissolved Chlorine Dioxide Sensors   I   Dissolved Oxygen Transmitter - ( DO Transmitter )   I   Conductivity Transmitter Micro-CT-211T  II  Temperature and Air Velociy Transmitter DUW 221  II   Clamp On Ultrasonic Flow Meter  II   Process Conductivity / TDS Controller & Transmitter  II   Micro Controller Bsed Conductivity Indicator / Controller  II   Electromagnetic Flow Meter MS FL 0117  II   High Precision Air / Gas Velocity Transmitter  II   Magnetic Float Operaded, Guided Level Switch  II   Micro Controller Based Conductivity / TDS  II   Micro controller Based PH Indicator / Controller  II   Micro Controller Based ORP Indicatorc / Controller  II   Digital pH Indicator CUM Transmitter  II   Micro Controller Based PH Meter MS pH 644  II   Digital Bench Top pH Meter  II   Digital Bench Top TDS / Conductivity Meter  II   Micro Controller Based TDS Indicator / Contorller  II   UPVc Electromagnetic Flow Meter MS FL 0117  I   Home   I   About Us   I   Contact Us   I
Enquiry   I   Sitemap