简体中文
English
Русский язык
Introduction To Temperature And Pressure Reduction Devices
Product Introduction
Overview Of Domestic Development In Temperature And Pressure Reduction
The Temperature And Pressure Reduction Device Was Introduced Into China From The Former Soviet Union In The 1950s. Up To Now, It Can Be Roughly Divided Into Three Generations Of Products.
The First Generation Of Pressure Reduction And Temperature Reduction Separation Settings: The Pressure Reduction Valve Of The Pressure Reduction System Is Mostly A Single-stage Plunger Type With A Throttle Orifice Plate To Achieve Pressure Reduction, While The Temperature Reduction System Is Achieved By Throttle Valves, Globe Valves, Feedwater Regulating Valves Or Feedwater Distribution Valves, Check Valves, Pipelines, Mixing Pipelines, Venturi Pipes, Etc; The Disadvantages Of The Temperature And Pressure Reduction Device In This Structural Form Are Complex Structure, Large Footprint, Inconvenient Installation And Maintenance, Narrow Adjustment Range, High Noise, And High Failure Rate; At The Same Time, The Pipeline Is Prone To Water Accumulation, Causing Water Hammer And Vibration, Which Reduces Its Service Life.
The Second Generation Is Integrated With Pressure And Temperature Reduction: Based On The First Generation, The Cooling Water Nozzle On The Pipeline Is Moved To The Upper Or Lower Part Of The Pressure Reducing Valve To Become A Temperature And Pressure Reduction Word, And Is Throttled And Depressurized With The Throttle Sub L Plate; By Eliminating The Cooling Water Pipeline In The First Generation Structure, The Footprint Is Reduced, The Structure Is Simplified, Installation And Maintenance Are Facilitated, Faults Are Reduced, Water Hammer Phenomena Inside The Pipeline Are Avoided, And The Service Life Of The Device Is Improved. The Disadvantage Is That The Temperature And Pressure Reducing Valve Only Adds A Nozzle On The Basis Of The Original Pressure Reducing Valve, And Its Internal Structural Form Has Not Changed, Nor Has The Temperature Reducing System Changed.
The Third Generation Is The Replacement Product Of The Second Generation: The Temperature And Pressure Reducing Valve Has Been Internally Changed To A Multi-stage Sleeve Type, Eliminating The Need For A Throttle Orifice Plate. At The Same Time, The Multi-stage Sleeve Simplified Throttle Small Pores Also Play A Role In Noise Reduction. The Temperature And Pressure Reducing Valve And Feedwater Regulating Valve Are Designed Using The Variable Flow Coefficient Design Method Of Siemens, Messoniland, And Fischer In Germany. Our Company Has Absorbed The Design Theories Of These Two Companies And Adopted This Method For The Design. The Characteristic Of This Design Form Is That It Matches The Design And Usage, And Can Be Fully Adjusted From O To 100%. Due To The Adaptability Of Water Supply Regulating Valves To Various Pressure Differentials, Throttling Valves Or Devices Have Been Eliminated In The Cooling System. The Third Generation Product Not Only Has All The Advantages Of The Second Generation Product, But Also Compensates For All The Shortcomings Of The Second Generation Product: 1. Reduced Pressure And Multi-level Step Adjustment Have Increased The Adjustment Range; 2. The Synchronous Adjustable Nozzle Is Used To Spray Water Inside The Valve, Which Improves The Atomization Effect.
Performance Reference Table For Temperature And Pressure Reduction Devices
| First Generation (from Other Manufacturers) | Second Generation (from Other Manufacturers) | Third Generation (developed By Our Company) | |
| Reduce Wen Reduce Press Valve | It Is A Single-stage Plunger Structure Shortcoming High Noise Can Easily Cause Vibration And Affect The Valve Service Life; The Adjustment Range Is Narrow, With Only One Level Adjustable. Due To The Frequent Use Of Range Selection. Therefore, The Adjustment Performance Is Inaccurate. | It Is A Single-stage Plunger Structure Advantage Install The Nozzle Inside The Valve For Good Atomization Effect. Shortcoming High Noise Can Easily Cause Vibration And Affect The Service Life Of Valves: The Adjustment Range Is Narrow, With Only One Level Adjustable: Due To The Frequent Use Of Range Shapes, The Adjustment Performance Is Not Accurate. | For Multi-level Cage Structure Advantage Install The Nozzle Inside The Valve For Good Atomization Effect. Multiple Adjustable Levels Inside The Valve: ● Adjustable Range O-100%: Design According To The User's Usage Parameters. Ensure The Accuracy Of Regulation At Each Level Through Variable Calculation. At The Same Time, The Cage Structure Can Play A Role In Noise Reduction. |
| Pipe The Way | Structure Of Pressure Reducing Pipeline And Temperature Reducing Pipeline Shortcoming The Pipeline Is Too Long, Add More Throttling Orifice Plates To The Pressure Reducing Pipeline Make Up For The Shortcomings Of Pressure Reducing Valves; And The Throttle Orifice Plate Cannot Be Adjusted, The Installation Of Mixed Pipes And Venturi Pipes Inside The Cooling Pipeline Increases Costs Increased Weight, Increased Footprint High Failure Rate, Inconvenient For Installation And Maintenance. | Cancelled The Cooling Pipeline Advantage Shortened The Length Of The Main Steam Pipeline: Reduced Weight And Footprint Reduced Malfunctions And Facilitated Installation And Maintenance. Shortcoming Adding A Throttle Orifice Plate To The Pipeline To Compensate For The Shortcomings Of The Temperature And Pressure Reducing Valve; The Throttle Orifice Plate Cannot Be Adjusted. | Cancelled The Cooling Pipeline Advantage Due To The Multi-stage Pressure Reduction Being Completed Inside The Valve, Pipelines Are Eliminated The Upper Throttle Orifice Plate Greatly Shortens The Length Of The Main Steam Pipeline. Reduced Weight And Footprint Reduced Malfunctions And Facilitated Installation And Maintenance. |
| Section Flow Valve | Used In Conjunction With The Regulating Valve To Set The Pressure Of The Regulating Valve | Cooperate With The Regulating Valve To Set The Pressure Of The Regulating Valve | The Regulating Valve Can Be Used Separately Without The Need For A Throttle Valve Or Throttling Device |
| Tune Section Valve | Mostly A Single-stage Constant Pressure Differential Structure Shortcoming The Adjustment Range Is Narrow, With Only One Level Adjustable; Due To The Frequent Use Of Range Selection. Therefore, The Adjustment Performance Is Inaccurate. It Cannot Be Concealed By Various Pressure Differentials And Must Be Used In Conjunction With Auxiliary Devices. Generally, It Cannot Be Used Alone. | Mostly A Single-stage Constant Pressure Differential Structure Shortcoming The Adjustment Range Is Narrow, With Only One Level Adjustable; Due To The Frequent Use Of Range Selection. Therefore, The Adjustment Performance Is Inaccurate. It Cannot Be Applied To Various Pressure Differentials And Must Be Used In Conjunction With Auxiliary Devices. Generally, It Cannot Be Used Alone. | For Multi-stage Constant Pressure Differential Structure Advantage ● Multi Level Adjustable, Accurate Adjustment Performance. Adopting Variable Design Can Be Suitable For Various Pressure Differentials. Can Be Used Alone. |
| Spray | For Adjustable Or Fixed Structures Shortcoming Directly Installed On The Main Pipeline, The Atomization Effect Is Poor, Which Makes It Easy For Water To Accumulate In The Main Pipeline And Cause Water Hammer, Thereby Causing Pipeline Vibration And Reducing Its Service Life. | Fixed Structure Installed Inside The Valve Shortcoming Improved Atomization Effect, Eliminating Atomization Section, | Fixed Or Adjustable Structure Directly Installed Into The Valve Advantage |
Purpose Of Temperature And Pressure Reduction Device
The WY Series Temperature And Pressure Reduction Device Is Used In Power Plants, Industrial Boilers, And Thermal Power Plants To Reduce The Temperature And Pressure Of The Incoming Steam With A Pressure Of P1 And A Temperature Of T1. The Secondary Steam Pressure P2 And Temperature T2 Reach The Required Values For The Production Process. The WY Series Temperature And Pressure Reduction Device And Its Configured Thermal Control Cabinet Have Comprehensive Functions Of Measurement, Execution And Control, And Are Widely Used In Industrial Sectors Such As Power Plants, Petrochemicals, Light Industry, Metallurgy, As Well As Urban Heating And Heating Systems.
Structural Characteristics Of Temperature And Pressure Reduction Device
The WY Series Temperature And Pressure Reduction Device Is A New Generation Product Developed By Our Company By Absorbing Temperature And Pressure Reduction Technology And Structure. It Consists Of Four Parts: A Temperature And Pressure Reducing Valve, A Steam Pipeline, A Cooling Water Pipeline, And A Thermal Regulation Device.
1. Temperature And Pressure Reducing Valve:
High Temperature And High Pressure Steam Undergo Simultaneous Temperature And Pressure Reduction Inside A Valve Body, And Achieve Steam Self-regulation. The Pressure Reducing Component Is A Porous Cage Structure With A Uniform Flow Hood And A Throttling Orifice Plate To Achieve Multi-stage Pressure Reduction, And The Pressure Reduction Stage Is Determined By The Pressure Difference Between The Steam Inlet And Outlet. Each Level Of Pressure Is Reduced By About Half, Thereby Reducing The Wear Of Throttle Components And Reducing The Vibration And Noise Generated By High-speed Steam. The Temperature Reduction Is Completed By A Temperature Reducer Installed Inside The Valve. The Temperature Reduction Water Is Sprayed Out Through A Mechanical Atomization Nozzle (cylindrical Multi Sub L Nozzle) Set Inside The Temperature Reducer. The High-speed Steam Flow Throttled By High-temperature Steam Fully Atomizes The Temperature Reduction Water, Allowing It To Quickly Mix With High-temperature Steam And Evaporate Into Low-temperature Steam, Which Can Avoid Water Hammer Caused By Water Accumulation In The Pipeline And Achieve A Good Temperature Reduction Effect. This Is The Difference From The Venturi Tube Thermostat. In Addition, The Number Of Water Injection Holes On The Nozzle Can Change Synchronously With The Steam Load, That Is, The Throttle Area, To Ensure Sufficient Water Injection Speed. Compared With Fixed Nozzles, It Improves The Atomization Effect Of Water Injection At The Same Steam Flow Rate, Is Suitable For Lower Steam Loads, And Increases The Range Of Steam Flow Usage. The Valve Seats All Adopt A Single Seat Structure, Which Reduces Leakage Compared To Double Seats (GB108681V Level Or Above). The Throttle Holes On The Pressure Reducing Component Are Strictly Arranged Linearly, And Can Be Continuously Opened (0-100%) When Lifted, Ensuring Accurate And High Precision Adjustment And Good Adjustment Performance.
This Valve Integrates The Functions Of Pressure Reduction, Temperature Reduction, And Noise Reduction Into The Valve Body In One Go, Which Can Avoid Premature Damage To Parts Caused By Excessive Temperature Differences And Improve The Service Life Of The Valve.
2. Steam Pipeline:
Due To The Use Of Temperature And Pressure Reducing Valves. The Mixing Pipeline For Separately Spraying Water For Temperature Reduction In The Original Temperature And Pressure Reduction Device Has Been Cancelled, Reducing The Length Of The Entire Device By About 1/2, Making The Structure Compact, Occupying Less Space, And Reducing Project Investment. Install Safety Valves, Pressure Gauges, Thermometers, Etc. On Pipelines To Ensure The Safe Operation Of The Equipment.
3. Desalination Water System:
It Consists Of A Water Supply Regulating Valve, Check Valve, Globe Valve, And Water Supply Pipeline. The Throttling Element Of The Water Supply Regulating Valve Is A Cage Type Sleeve Or Multi-stage Throttling Element, Which Can Withstand High Pressure Differences And Avoid Cavitation Caused By High-pressure Media Passing Through Small Gaps, Resulting In Cavitation Damage To The Valve Seat Surface And Throttling Element, And Reducing Leakage. The Throttle Holes Are Arranged Linearly, And Regulating Valves Of The Same Diameter Have Different Cv Values To Choose From, Ensuring The Accuracy And Sensitivity Of The Regulation.
4. Thermal Regulation Device:
Including Two Parts: Thermal Control Cabinet And Electric Actuator. The Control Methods Are Divided Into Two Types According To The Ordering Needs: Automatic Control (electronic Control Instrument Automatic Control) And Remote Control. Its Automatic Control Cabinet Includes: Temperature Display Instrument, Pressure Display Instrument, Regulator, Alarm, Operator, Etc. The Electric Actuators Equipped With Temperature And Pressure Reducing Valves And Regulating Valves Are Available In Two Types For Ordering: Straight Stroke And Angular Stroke. Its Steam Pressure Regulation Can Be Achieved By Using An Instrument Pressure Transmitter, Which Can Convert Steam Pressure Fluctuations Into 4-20mA And Current Signals. The Signal Is Transmitted To The Electric Actuator Unit Through The Proportional Integral Regulator To Drive The Temperature And Pressure Reducing Valve To Achieve Pressure Regulation. The Regulation Of Steam Temperature Uses A Thermistor (thermocouple) To Transmit The Temperature Signal Through A Proportional Integral Derivative Regulator And Operator Unit, And Then Sends The Electrical Signal To The Electric Actuator To Drive The Water Supply Regulating Valve To Adjust The Water Spray Volume, Achieving The Purpose Of Temperature Reduction.
Main Performance Indicators Of Temperature And Pressure Reduction Device
The Variation Range Of Export Flow Is Basically 10% Q-100% Q. According To The Requirements, The Minimum Flow Rate Can Be Even Lower.
● Inlet Pressure And Temperature: Low Pressure P1 ≤ 1. OMPa, T1 ≤ 300 ℃
Medium Pressure P1 ≤ 4.0MPa. F1 ≤ 450 ℃
Sub High Pressure P1 ≤ 5.4MPa. T1 ≤ 485 ℃
High Temperature And High Pressure P1 ≤ 20MPa, T1 ≤ 570 ℃
The Outlet Steam Pressure P2 And Temperature T2 Shall Be Adjusted According To The User's Required Values, With An Accuracy Of Not Less Than 2.5 Levels.
Noise: When The Device Is Operating Normally, The Noise Level Is Measured At A Distance Of One Meter Downstream Of The Temperature And Pressure Reducing Valve And One Meter Away From The Pipe Wall, And The Noise Level Is Below 85 Decibels.
Execution Standards For Temperature And Pressure Reduction Devices
Standard For Temperature And Pressure Reduction Devices: JB/T6323-2002 "Temperature And Pressure Reduction Devices"
Standard For Temperature And Pressure Reducing Valves: GB/T10868-2005 "Power Station Temperature And Pressure Reducing Valves"
Standard For Water Supply Control Valves: GB/T10869-89 "Technical Conditions For Power Station Control Valves"
Other Valve Standards: JB/T3595-2002 "General Requirements For Power Station Valves"
Main Component Materials
Temperature And Pressure Reducing Valve
The Valve Body And Cover Are Made Of High-quality Carbon Steel For Medium And Low Pressures, Chromium Molybdenum Steel For Sub High Pressures, And Chromium Molybdenum Vanadium Steel For High Temperatures And Pressures; The Sealing Surface Of The Valve Seat Is Made Of Welded Hard Alloy, And All Throttle Components Inside The Valve Are Made Of Stainless Steel Or Chromium Nickel Stainless Steel. The Valve Stem Is Made Of Nitride Steel Or Stainless Steel. The Sealing Filler Is Flexible Graphite, And The Sealing Between The Valve Body And The Valve Cover Is A Self Tight Seal For High Temperature And High Pressure Parameters. The Sealing Ring Is Made Of Flexible Graphite And Stainless Steel Wire, And The Rest Is Sealed With Metal Winding Gaskets Connected By Flanges.
Water Supply Regulating Valve
The Valve Body And Valve Cover Are Made Of High-quality Carbon Steel, The Valve Seat Is Made Of Stainless Steel Or Hard Alloy Welded, The Throttle And Valve Stem Are Made Of Heat-treated Stainless Steel, And The Seal Is Made Of Flexible Graphite. The Flange Seal Is Made Of Metal Wrapped Gasket.
The Other Supporting Components Used In The Device, Such As Various Valves, Pipelines, Flanges, Joints, Bolts, Etc., Are Selected According To The Corresponding Temperature And Pressure Parameters In Accordance With International Regulations.
Installation And Usage Instructions
The Temperature And Pressure Reducing Valve And The Water Supply Regulating Valve Must Be Installed Vertically, With The Center Of Gravity At The Bottom And Sufficient Space Around For Easy Disassembly And Maintenance Of The Valve. The Direction Of The Arrow Indicating The Flow Of The Medium To The Valve Body Should Be Adjusted According To The Instruction Manual Of The Actuator.
At The Inlet Of The Temperature And Pressure Reducing Valve, There Should Be A Straight Pipe Induction Length. The Length Of The Inlet Straight Pipe Section Should Be ≥ 5DN And Not Less Than 2m, And The Outlet Straight Pipe Section Should Have A Downstream Slope Of 1-5%.
The Installation Position Of The Water Supply Regulating Valve Should Not Be Far Away From The Temperature And Pressure Reducing Valve, And Slightly Lower Than The Inlet Of The Temperature And Pressure Reducing Valve.
After The Valve Installation Is Completed, The Inside Of The Pipe Should Be Cleaned Thoroughly To Remove All Kinds Of Debris Such As Oxide Scale And Welding Slag. To Prevent Impurities From Damaging The Interior Of The Valve During Cleaning, Protective Measures Must Be Taken, Such As Using Plugs To Protect The Valve Seat Or Flushing The Pipeline Before Connecting To The Valve. The Valve Sealing Packing Is Flexible Graphite. The Expansion Performance Is Good After Heating, So It Should Not Be Compressed Too Tightly In The Cold State. When Replacing The Packing, Be Careful To Avoid Damaging The Surface Of The Valve Stem.
A Fixed Bracket Should Be Installed Under The Safety Valve On The Steam Pipeline, And Movable Brackets Should Be Installed At The End Of The Temperature And Pressure Reducing Valve And Steam Pipeline Respectively.
A Steam Trap Should Be Installed At The Lowest Point Of The Steam Inlet Pipeline, And A Temperature Compensator Should Be Installed When Connecting The Steam Inlet And Outlet To This Device.
The Installation Pipelines, Measuring Elements, Connectors, Etc. Required For The Installation Of Large Hangers, Safety Valve Exhaust Pipes, Steam Traps, Compensators, And Thermal Regulating Devices Of This Device Are All Borne By The User. The Supply Of Main Thermal Regulating Devices Shall Be In Accordance With The Provisions Of The Purchase Contract Agreement.
All Pipes With A Diameter Less Than 57mm Shall Be Supplied As Straight Pipes And Shall Be Bent And Welded On Site During Installation.
All Components Of The Steam Pipeline From The Inlet Flange Of The Temperature And Pressure Reducing Valve To The Outlet Of The Secondary Steam Pipeline (excluding The Closed-circuit Valve At The Inlet And Outlet And The Inlet Filter Valve).
All Components Of The Cooling Water Pipeline From The Inlet Shut-off Valve To The Cooling And Pressure Reducing Valve (excluding The Cooling Water Pipeline).
Ordering Instructions
Product Name, Steam Flow Rate (inlet Or Outlet Flow Rate), Inlet Steam Pressure (P1), Temperature (t1), Outlet Steam Pressure (P2), Temperature (t2), Desalinated Water Pressure (P3), Temperature (t3) (desalinated Water Pressure Should Be 1MPa Higher Than Outlet Steam Pressure).
Control Mode: Self-control Or Remote Control, Electric Or Pneumatic.
This Device Is A Non-standard Product, And An Agreement Needs To Be Signed When Placing An Order To Design And Manufacture It According To The Specific Requirements Of The Agreement.
The Installation And Commissioning Of The Temperature And Pressure Reduction Device Are The Responsibility Of The Installation Department. If Assistance From Our Company Is Required For Commissioning And Operation, Please Indicate It In The Agreement And Charge Appropriate Commissioning Fees
Our Company Can Provide Matching Automation Instrument Panels (automatic Control Cabinets). Welcome To Negotiate And Place Orders