Combination Three-way Valve Integral Ball Valve

Overview

In The Past, The High-pressure Ammonia Water Injection Circulation System Of Coke Ovens In Various Coking Plants Generally Used Traditional L-shaped Three-way Ball Valves For High And Low Pressure Conversion Systems. Due To The Special Working Conditions In This Area, The L-shaped Three-way Ball Valves Would Leak After Several Months Or Even Days Of Installation And Operation, Causing A Decrease In System Pressure. The Leaked High-pressure Ammonia Water Would Suck The Coal Powder In The Coke Oven To The Gas Collection Pipe, Seriously Causing Negative Pressure In The Carbonization Chamber, Which Not Only Affects The Quality Of Coke But Also Affects The Tightness Of The Furnace Body Due To The Installation Of The Valve On The Top Of The Coke Oven, Where The Temperature Is High And The Working Conditions Are Poor, It Has Brought Great Difficulties To The Replacement Of The Valve. The Frequent Replacement Of Valves Has Also Caused Significant Economic Losses To The Factory And Seriously Polluted The Environment.

In Order To Solve This Problem For Users, Our Company Has Conducted In-depth Research On The Valve And Operating System. The YQ44F-40 DN25 Combination Three-way Valve With A Completely New Structure Has Finally Been Successfully Developed, Fundamentally Solving The Problems Of Short Service Life And Easy Leakage Of The Original L-shaped Three-way Ball Valve. It Has Been Widely Used In Major Coking Plants Across The Country, Such As Beijing Coking Plant, Shijiazhuang Coking Plant, Panzhihua Coking Plant, Kunming Iron And Steel Coking Plant, And Baotou Iron And Steel Company Coking Plant, And Has Been Well Received And Praised By Users For Many Years.

Failure Analysis Of L-shaped Three-way Ball Valve

In The Past, Q44F-40 DN25L Three-way Ball Valves Were Used For The High And Low Pressure Conversion Of High-pressure Ammonia Water Injection Circulation Systems In Coking Plants Across The Country. The Typical Structure Of This Valve Is Shown In Figure 1, And Its Main Sealing Components Consist Of Left And Right Polytetrafluoroethylene Valve Seats And A Spherical Body With An L-shaped Channel.

When The Valve Is First Used After Leaving The Factory, There Is A Certain Pre Tightening Force Between The Valve Seats On Both Sides And The Ball Body, So The Valve Can Maintain Sealing For A Period Of Time. Due To The Cold Flow Deformation Of The PTFE Valve Seat Under Certain Temperature And Pressure, And The Wear Of The Valve Seat During Use, Especially The Scraping Effect Of The Narrow Part Formed Between The Two Outlets Of The L-shaped Channel Of The Ball On The Valve Seat And The Adhesion Of Impurities And Tar, The Damage To The Valve Seat Is Further Exacerbated. The L-shaped Three-way Ball Valve Used For The High And Low Pressure Conversion Of The Coke Oven High-pressure Ammonia Water Injection Circulation System Has A Large Pressure Difference Between The High And Low Pressure Inlet Sides, And The High-pressure Medium Generates A Force That Pushes The Ball Towards The Low-pressure Side Valve Seat. After A Certain Period Of Use, As The PTFE Valve Seat Gradually Deforms, The Assembly Preload Between The Valve Seat And The Ball Gradually Disappears, And Eventually A Gap Appears Between The Valve Seat And The Ball. When The High-pressure End Of The L-shaped Three-way Ball Valve Is Closed And The Low-pressure End Is Opened, The Ammonia Water At The High-pressure End Will Leak From The Gap Between The Valve Seat And The Ball To The Outlet End. Due To The Cold Flow Deformation Of The PTFE Valve Seat Under Certain Pressure And Temperature, The Pre Tightening Force Between The Valve Seat And The Sphere Will Gradually Disappear. Therefore, The Traditional L-shaped Three-way Ball Valve Is Selected For The High And Low Pressure Conversion Of The High-pressure Ammonia Water Injection Circulation System In The Coke Oven. No Matter How The Valve Seat Material Is Improved Or The Processing And Assembly Accuracy Is Increased, The Service Life Of The Valve Can Only Be Appropriately Extended. However, The Valve Will Inevitably Leak After A Period Of Use.

After In-depth Analysis Of The Operating Parameters Of The System And The Causes Of Leakage In The Traditional L-shaped Three-way Ball Valve Structure, Our Company Has Successfully Developed A New Structure Of Combined Three-way Valve That Combines Ball Valve And Check Valve Through Repeated Experimental Research. This Solves The Problems Of Easy Leakage And Short Service Life Of Traditional L-shaped Three-way Ball Valves. A Large Number Of Tests And Practical Use Have Shown That The Service Life Of Combined Three-way Valves Is More Than Ten Times Longer Than That Of L-shaped Three-way Ball Valves.

Structure Principle And Characteristics Of Combined Three-way Valve

The Structure Of The YQ44F-40 DN25 Combination Three-way Valve Developed By Our Company Is Shown In Figures 3, 4, And 5. It Is Composed Of A Straight Through Floating Ball Valve And A Sleeve Type Check Valve. The Left Ball Valve Is Connected To The High-pressure System, The Right Check Valve Is Connected To The Low-pressure System, And The Middle Outlet Is Connected To The Discharge Pipeline. When The Ball Valve Is Closed, The High-pressure Channel Is Cut Off, And The Check Valve Disc Automatically Opens Under The Push Of The Low-pressure Medium. The Low-pressure Ammonia Water Is Discharged Through The Middle Outlet Channel. When The Ball Valve Is Opened, High-pressure Ammonia Water Pushes The Check Valve Disc Towards The Valve Seat, The Check Valve Closes, The Low-pressure Channel Is Cut Off, And High-pressure Ammonia Water Is Discharged Through The Intermediate Outlet Channel. After Spraying, Close The Ball Valve, The Check Valve Will Automatically Open, And Low-pressure Ammonia Water Can Be Discharged Automatically. Therefore, As Long As The Rubber Operates The Traditional Three-way Ball Valve, The Valve Stem Can Be Turned On And Off At 90 ℃ To Complete The High And Low Pressure Switching.

The Main Features Of The Combination Three-way Valve Are As Follows:

1. Due To The Fact That The Straight Through Floating Ball Valve In The Combination Three-way Valve Only Serves The Opening And Closing Function Of The High-pressure System Side, Rather Than The Three-way Conversion Function, Even If The Pre Tightening Force Between The Ball And The Valve Seat Disappears After A Period Of Use, And There Is A Gap Between The Ball And The Valve Seat, When The Ball Valve Is Closed, The Pressure Of The High-pressure Side Medium Can Still Push The Ball Towards The Outlet Side Valve Seat, Making The Ball And The Outlet Side Valve Seat Tightly In Contact. Therefore, The Valve Still Has Good Sealing Performance. The Combination Three-way Valve Solves The Problem Of Easy Sealing Failure In Traditional L-shaped Three-way Ball Valves. The Low-pressure Side Check Valve Is Made Of Stainless Steel, With A Unique Design, Sensitive Action, Reliable Sealing, And A Relatively Long Service Life.

2. The Structural Length And Connection Dimensions Of The Combination Three-way Valve Are The Same As Those Of The Traditional L-shaped Three-way Ball Valve, Making Valve Replacement Convenient.

3. The Combination Three-way Valve Is Easy To Operate And Identical To The Traditional L-shaped Three-way Ball Valve.

4. The Valve Body Is Designed With An Integral Structure, Which Can Effectively Prevent Valve Leakage And Improve The Overall Design Of The Valve.

Standard Specification For Combination Three-way Valve Integral Ball Valve

Performance Specification For Combination Three-way Valve Integral Ball Valve

Main Structure And Dimensions Of Combination Three-way Valve Integral Ball Valve

Ordering Instructions

The Ball Valve Of The Combination Three-way Valve Is Connected To The High Pressure End On One Side, And The Check Valve Is Connected To The Low Pressure End On The Other Side. In Order To Adapt To Different Pipeline System Layouts Of Users, The Combination Three-way Valve Is Divided Into Forward And Reverse Structures, As Shown In Figure 5. When Ordering, Users Should Determine Whether To Use The Forward Structure Or Reverse Structure According To The Actual Situation, And Indicate In The Contract That The Model Of The Forward Combination Three-way Valve Is YQ44F-40-Z, And The Model Of The Reverse Combination Three-way Valve Is YQ44F-40-F.

This Combination Three-way Valve Is Specially Developed And Designed For The High And Low Pressure Conversion Parts Of The High-pressure Ammonia Water Injection Circulation System In Coking Plants. However, Other Industries And Departments With Similar Working Conditions Can Also Use This Structure Of Valve. Our Company Can Develop And Design According To The Needs Of Users.

Integral Straight Through Ball Valve

Overview

In The Ammonia Water System Of The Coke Oven, The Integral Straight Through Ball Valve Is Used In Conjunction With The Combined Three-way Valve. During System Shutdown And Pipeline Equipment Maintenance, The Integral Straight Through Ball Valve Is Closed To Cut Off The Ammonia Water Medium. However, During Normal System Operation, The Integral Straight Through Ball Valve Is Always In A Fully Open State.

Integral Straight Through Ball ValveStructural Characteristics

In Addition To The Advantages Of Low Fluid Resistance, Quick Opening And Closing, And Good Sealing Performance Of General Ball Valves, The Integral Straight Through Ball Valve Adopts An Integral Structural Design, Which Is Simple, Compact, Lightweight, And Durable. Compared With Commonly Used Two-piece Ball Valves, It Eliminates The Two Bolted Flanges In The Middle, Reduces Leakage Points, And Provides More Reliable Sealing. Adopting Reinforced Polytetrafluoroethylene Valve Seat, It Has Better Pressure Resistance, Temperature Resistance, Wear Resistance, And Longer Service Life.

Integral Straight Through Ball ValveStandard Specification

Integral Straight Through Ball ValvePerformance Specifications

Integral Straight Through Ball ValveMain Structure And Dimensions

Integral Straight Through Ball ValveMain Component Materials