Tag Archives: lever gear

China Professional High Quality Plastic PP-R PPR Wafer Worm Gear Butterfly Valve FRPP Fr-PP PPG Handle Butterfly Valve Lever PVC UPVC Butterfly Valve Level DIN ANSI JIS Standard near me manufacturer

Solution Description

Large Quality

Plastic
PP-R PPR Wafer Worm Equipment Butterfly Valve
FRPP FR-PP PPG Handle Butterfly Valve Lever
PVC UPVC Butterfly Valve Degree
DIN ANSI JIS Common
DN50-DN300 ( 2″-twelve” )

Substantial Good quality

Plastic
PP-R PPR Wafer Worm Gear Butterfly Valve
FRPP FR-PP PPG Take care of Butterfly Valve Lever
PVC UPVC Butterfly Valve Level
DIN ANSI JIS Normal

PVC Butterfly Valve ( Degree & Gear )

FRPP Butterfly Valve  ( Amount & Equipment )

PVC Non Actuator Butterfly Valve for Electrical & Pneumatic Actuator Usage


PP-R Butterfly Valve for Drinking water Supply DIN ANSI JIS Standard
DN.50mm to DN.300mm

Functions
Water Supply
Material : PP-R
Standard : DIN ANSI JIS Common
Connection : Flange
SIZE : DN50 ( 63mm ) 2″ ~ DN300 ( 315mm ) 12″
Working Pressure : 150PSI one.0 MPa
                                   100PSI  0.6MPa


C-PVC FR-PP PP-R Butterfly Valve for Electrical & Pneumatic Actuator Use
DN50-DNtwo00 ( 2″- 8” )

DN50 – DN150 (2″- 6″) 100PSI PN0.8MPa  
DN200 (8″) 80PSI  PN0.5MPa

Common:  DIN, ANSI, JIS Standard      
Hi-Good quality   Low Torque   Acid-Proof   Alkali-Evidence   100% Check

Can be Customized
Diverse Dimensions Shaft of Square, Oblate, Round Keyway

Hefty the Valve Physique, Thicken the Valve Plate
Thicken the Valve Stem, the Valve Stem Limit

With Carbon Steel Stem #45 & EPDM Rubber
With Stainless Steel Stem #304 & EPDM / FPM Rubber
With Stainless Steel  Stem #316 & EPDM / FPM Rubber

Integrated Construction of Valve Seat and Valve Physique

Actuator Mounting Gap
with ISO5211 Normal With no Bracket, Immediate Relationship

C-PVC PVC-U FRPP PP-R Butterfly Valve ( Lever Sort ) DN50-DN200 ( 2″- 8″ )

Functioning Strain:  
DN50-DN150 ( 2″- 6″ ) 150PSI  PN1.0MPa
DN200 ( 8″ ) 90PSI  PN0.6MPa   
                                  
Common: DIN, ANSI, JIS Regular
Hello-High quality, Reduced Torque, Lockable, Acid-Evidence, Alkali-Evidence, a hundred% Test

PVC Butterfly Valve Patent Technological innovation
Enhance the Locking Gap to Lock the Valve

Integrated Construction of Valve Seat and Valve Body.                                                                                                      
Weighty the Valve Body, Thicken the Valve Plate
Thicken the Valve Stem, the Valve Stem Restrict
  
With Carbon Steel Stem #forty five & EPDM Rubber
With Stainless Steel Stem #304 & EPDM / FPM Rubber
With Stainless Metal  Stem #316 & EPDM / FPM Rubber
Longer & Broader Take care of,Manage Lever Even bigger, Energy Operation

C-PVC FR-PP PP-R Butterfly Valve ( Gear Sort ) DN8-DN300 ( 3“- onetwo” )

DNeight-DN200 (3“- 8”) 150PSI PN1.0MPa  
DN250-DN300 (10″- 12″) 90PSI  PN0.6MPa

Standard:  DIN, ANSI, JIS Normal      
Hello-Good quality   Low Torque   Acid-Proof   Alkali-Evidence   100% Test

              Hygienic Level PVC PP-R Raw Materials Injection              
Gear Box and Hand Wheel Can Be Made of Plastic

Integrated Construction of Valve Seat and Valve Human body

With Carbon Steel Stem #forty five & EPDM Rubber
With Stainless Steel Stem #304 & EPDM / FPM Rubber
With Stainless Metal  Stem #316 & EPDM / FPM Rubber
 

Calculating the Deflection of a Worm Shaft

In this write-up, we are going to discuss how to calculate the deflection of a worm gear’s worm shaft. We will also go over the traits of a worm equipment, like its tooth forces. And we will protect the critical traits of a worm gear. Study on to find out much more! Right here are some things to think about just before purchasing a worm equipment. We hope you get pleasure from understanding! Right after reading this article, you’ll be well-outfitted to pick a worm gear to match your requirements.
worm shaft

Calculation of worm shaft deflection

The principal aim of the calculations is to figure out the deflection of a worm. Worms are utilised to switch gears and mechanical devices. This kind of transmission utilizes a worm. The worm diameter and the number of teeth are inputted into the calculation gradually. Then, a desk with appropriate answers is shown on the display. Following completing the table, you can then go on to the primary calculation. You can modify the energy parameters as effectively.
The highest worm shaft deflection is calculated utilizing the finite factor method (FEM). The model has a lot of parameters, including the dimension of the aspects and boundary circumstances. The results from these simulations are compared to the corresponding analytical values to calculate the optimum deflection. The outcome is a table that displays the optimum worm shaft deflection. The tables can be downloaded below. You can also uncover far more data about the distinct deflection formulas and their applications.
The calculation strategy employed by DIN EN 10084 is dependent on the hardened cemented worm of 16MnCr5. Then, you can use DIN EN 10084 (CuSn12Ni2-C-GZ) and DIN EN 1982 (CuAl10Fe5Ne5-C-GZ). Then, you can enter the worm encounter width, possibly manually or employing the car-advise option.
Frequent approaches for the calculation of worm shaft deflection offer a very good approximation of deflection but do not account for geometric modifications on the worm. Whilst Norgauer’s 2021 strategy addresses these issues, it fails to account for the helical winding of the worm tooth and overestimates the stiffening effect of gearing. More innovative methods are essential for the successful design of slender worm shafts.
Worm gears have a low sounds and vibration when compared to other varieties of mechanical units. Nonetheless, worm gears are typically limited by the sum of dress in that takes place on the softer worm wheel. Worm shaft deflection is a considerable influencing factor for noise and use. The calculation strategy for worm equipment deflection is offered in ISO/TR 14521, DIN 3996, and AGMA 6022.
The worm equipment can be made with a precise transmission ratio. The calculation includes dividing the transmission ratio between more phases in a gearbox. Energy transmission input parameters affect the gearing homes, as effectively as the content of the worm/gear. To obtain a better effectiveness, the worm/equipment material ought to match the conditions that are to be skilled. The worm gear can be a self-locking transmission.
The worm gearbox includes many device aspects. The principal contributors to the complete electricity decline are the axial masses and bearing losses on the worm shaft. Hence, diverse bearing configurations are studied. 1 sort involves locating/non-locating bearing preparations. The other is tapered roller bearings. The worm equipment drives are considered when finding vs . non-locating bearings. The examination of worm gear drives is also an investigation of the X-arrangement and four-level contact bearings.
worm shaft

Affect of tooth forces on bending stiffness of a worm gear

The bending stiffness of a worm equipment is dependent on tooth forces. Tooth forces increase as the electricity density will increase, but this also prospects to increased worm shaft deflection. The ensuing deflection can impact effectiveness, use load potential, and NVH conduct. Steady improvements in bronze components, lubricants, and production top quality have enabled worm equipment makers to create ever more substantial power densities.
Standardized calculation strategies get into account the supporting effect of the toothing on the worm shaft. Even so, overhung worm gears are not provided in the calculation. In addition, the toothing spot is not taken into account except if the shaft is developed next to the worm gear. Likewise, the root diameter is taken care of as the equivalent bending diameter, but this ignores the supporting result of the worm toothing.
A generalized system is provided to estimate the STE contribution to vibratory excitation. The results are applicable to any gear with a meshing pattern. It is suggested that engineers test diverse meshing approaches to get a lot more exact outcomes. One way to check tooth-meshing surfaces is to use a finite component stress and mesh subprogram. This software will evaluate tooth-bending stresses beneath dynamic hundreds.
The impact of tooth-brushing and lubricant on bending stiffness can be attained by rising the stress angle of the worm pair. This can reduce tooth bending stresses in the worm gear. A even more method is to include a load-loaded tooth-make contact with analysis (CCTA). This is also utilized to evaluate mismatched ZC1 worm travel. The benefits acquired with the approach have been extensively utilized to different sorts of gearing.
In this research, we located that the ring gear’s bending stiffness is hugely motivated by the tooth. The chamfered root of the ring equipment is larger than the slot width. Therefore, the ring gear’s bending stiffness varies with its tooth width, which increases with the ring wall thickness. In addition, a variation in the ring wall thickness of the worm gear triggers a higher deviation from the design specification.
To realize the influence of the tooth on the bending stiffness of a worm equipment, it is essential to know the root form. Involute enamel are prone to bending anxiety and can split underneath extreme conditions. A tooth-breakage evaluation can manage this by determining the root condition and the bending stiffness. The optimization of the root form directly on the closing gear minimizes the bending pressure in the involute tooth.
The affect of tooth forces on the bending stiffness of a worm gear was investigated utilizing the CZPT Spiral Bevel Equipment Check Facility. In this examine, multiple teeth of a spiral bevel pinion have been instrumented with pressure gages and analyzed at speeds ranging from static to 14400 RPM. The tests were done with power ranges as higher as 540 kW. The final results received had been compared with the investigation of a a few-dimensional finite factor model.
worm shaft

Traits of worm gears

Worm gears are exclusive kinds of gears. They attribute a selection of qualities and programs. This post will look at the qualities and advantages of worm gears. Then, we will analyze the widespread applications of worm gears. Let’s get a seem! Just before we dive in to worm gears, let us review their capabilities. Hopefully, you are going to see how adaptable these gears are.
A worm gear can obtain substantial reduction ratios with tiny hard work. By including circumference to the wheel, the worm can drastically boost its torque and reduce its pace. Standard gearsets call for a number of reductions to obtain the same reduction ratio. Worm gears have less shifting parts, so there are fewer locations for failure. Nevertheless, they are unable to reverse the course of energy. This is simply because the friction in between the worm and wheel can make it not possible to shift the worm backwards.
Worm gears are extensively used in elevators, hoists, and lifts. They are particularly beneficial in purposes in which halting speed is essential. They can be integrated with more compact brakes to make sure security, but should not be relied on as a principal braking program. Usually, they are self-locking, so they are a good selection for several programs. They also have several advantages, like improved performance and protection.
Worm gears are created to obtain a specific reduction ratio. They are generally arranged amongst the input and output shafts of a motor and a load. The two shafts are typically positioned at an angle that assures proper alignment. Worm equipment gears have a centre spacing of a body measurement. The middle spacing of the gear and worm shaft determines the axial pitch. For occasion, if the gearsets are set at a radial length, a smaller sized outer diameter is necessary.
Worm gears’ sliding contact decreases effectiveness. But it also guarantees peaceful operation. The sliding motion limits the performance of worm gears to thirty% to 50%. A couple of methods are released herein to decrease friction and to make good entrance and exit gaps. You are going to quickly see why they’re such a functional decision for your requirements! So, if you are thinking about buying a worm gear, make certain you study this write-up to find out far more about its qualities!
An embodiment of a worm equipment is explained in FIGS. 19 and twenty. An alternate embodiment of the program makes use of a solitary motor and a solitary worm 153. The worm 153 turns a equipment which drives an arm 152. The arm 152, in switch, moves the lens/mirr assembly ten by various the elevation angle. The motor manage unit 114 then tracks the elevation angle of the lens/mirr assembly ten in relation to the reference place.
The worm wheel and worm are both manufactured of steel. Nevertheless, the brass worm and wheel are made of brass, which is a yellow metallic. Their lubricant choices are a lot more versatile, but they are limited by additive limits because of to their yellow metal. Plastic on metal worm gears are typically discovered in light load programs. The lubricant used relies upon on the sort of plastic, as a lot of sorts of plastics respond to hydrocarbons identified in standard lubricant. For this cause, you need a non-reactive lubricant.

China Professional High Quality Plastic PP-R PPR Wafer Worm Gear Butterfly Valve FRPP Fr-PP PPG Handle Butterfly Valve Lever PVC UPVC Butterfly Valve Level DIN ANSI JIS Standard     near me manufacturer China Professional High Quality Plastic PP-R PPR Wafer Worm Gear Butterfly Valve FRPP Fr-PP PPG Handle Butterfly Valve Lever PVC UPVC Butterfly Valve Level DIN ANSI JIS Standard     near me manufacturer

China Good quality High Quality PPR PP-R Worm Gear Butterfly Valve Fr-PP FRPP Wafer Industrial Butterfly Valve Lever PP PPG PVC Butterfly Control Valve DIN ANSI JIS Standard with Good quality

Merchandise Description

Substantial Good quality

PPR PP-R Worm Gear Butterfly Valve
FR-PP FRPP Wafer Industrial Butterfly Valve Lever
PP PPG PVC Butterfly Management Valve
DIN ANSI JIS Standard 
DN50-DN300 ( 2″-twelve” )

High High quality

PPR
PP-R
Worm Gear Butterfly Valve
FR-PP
FRPP
Wafer Industrial Butterfly Valve
PP
PPG
PVC
Butterfly Handle Valve Lever DIN ANSI JIS Common

PVC Butterfly Valve ( Stage & Gear )

FRPP Butterfly Valve  ( Stage & Equipment )

PVC Non Actuator Butterfly Valve for Electric powered & Pneumatic Actuator Utilization


PP-R Butterfly Valve for Water Supply DIN ANSI JIS Standard
DN.50mm to DN.300mm

Features
Water Supply
Material : PP-R
Standard : DIN ANSI JIS Regular
Connection : Flange
SIZE : DN50 ( 63mm ) 2″ ~ DN300 ( 315mm ) twelve”
Working Pressure : 150PSI one.0 MPa
                                   100PSI  0.6MPa

C-PVC FR-PP PP-R Butterfly Valve for Electric powered & Pneumatic Actuator Usage
DN50-DN200 ( 2″- eight” )

DN50 – DN150 (2″- 6″) 100PSI PN0.8MPa  
DN200 (8″) 80PSI  PN0.5MPa

Common:  DIN, ANSI, JIS Common      
Hi-Good quality   Low Torque   Acid-Evidence   Alkali-Proof   100% Check

Can be Custom-made
Diverse Sizes Shaft of Square, Oblate, Spherical Keyway

Heavy the Valve Body, Thicken the Valve Plate
Thicken the Valve Stem, the Valve Stem Restrict

With Carbon Metal Stem #45 & EPDM Rubber
With Stainless Steel Stem #304 & EPDM / FPM Rubber
With Stainless Metal  Stem #316 & EPDM / FPM Rubber

Built-in Construction of Valve Seat and Valve Human body

Actuator Mounting Hole
with ISO5211 Common Without having Bracket, Immediate Link

C-PVC PVC-U FRPP PP-R Butterfly Valve ( Lever Variety ) DN50-DN200 ( 2″- 8″ )

Working Force:  
DN50-DN150 ( 2″- 6″ ) 150PSI  PN1.0MPa
DN200 ( 8″ ) 90PSI  PN0.6MPa   
                                  
Normal: DIN, ANSI, JIS Regular
Hi-Top quality, Minimal Torque, Lockable, Acid-Evidence, Alkali-Proof, a hundred% Examination

PVC Butterfly Valve Patent Technologies
Enhance the Locking Hole to Lock the Valve

Integrated Composition of Valve Seat and Valve Human body.                                                                                                      
Hefty the Valve Body, Thicken the Valve Plate
Thicken the Valve Stem, the Valve Stem Restrict
  
With Carbon Metal Stem #45 & EPDM Rubber
With Stainless Steel Stem #304 & EPDM / FPM Rubber
With Stainless Steel  Stem #316 & EPDM / FPM Rubber
For a longer time & Wider Manage,Manage Lever Larger, Work Operation

C-PVC FR-PP PP-R Butterfly Valve ( Equipment Kind ) DNeight-DN300 ( three“- 12” )

DN8-DN200 (three“- 8”) 150PSI PN1.0MPa  
DN250-DN300 (10″- twelve”) 90PSI  PN0.6MPa

Normal:  DIN, ANSI, JIS Regular      
Hello-Good quality   Low Torque   Acid-Proof   Alkali-Proof   100% Check

              Hygienic Amount PVC PP-R Uncooked Material Injection              
Equipment Box and Hand Wheel Can Be Created of Plastic

Built-in Construction of Valve Seat and Valve Physique

With Carbon Metal Stem #forty five & EPDM Rubber
With Stainless Steel Stem #304 & EPDM / FPM Rubber
With Stainless Metal  Stem #316 & EPDM / FPM Rubber

An Overview of Worm Shafts and Gears

This post gives an overview of worm shafts and gears, such as the type of toothing and deflection they expertise. Other topics lined contain the use of aluminum as opposed to bronze worm shafts, calculating worm shaft deflection and lubrication. A comprehensive understanding of these issues will assist you to design greater gearboxes and other worm gear mechanisms. For further information, make sure you check out the connected web sites. We also hope that you will discover this article useful.
worm shaft

Double throat worm gears

The pitch diameter of a worm and the pitch of its worm wheel must be equal. The two varieties of worm gears have the very same pitch diameter, but the big difference lies in their axial and circular pitches. The pitch diameter is the distance amongst the worm’s teeth along its axis and the pitch diameter of the more substantial gear. Worms are created with remaining-handed or proper-handed threads. The guide of the worm is the distance a position on the thread travels in the course of one revolution of the worm gear. The backlash measurement ought to be made in a couple of diverse locations on the gear wheel, as a huge quantity of backlash implies tooth spacing.
A double-throat worm gear is developed for large-load applications. It provides the tightest relationship between worm and equipment. It is vital to mount a worm equipment assembly correctly. The keyway style calls for several factors of contact, which block shaft rotation and support transfer torque to the gear. Right after determining the location of the keyway, a gap is drilled into the hub, which is then screwed into the equipment.
The dual-threaded style of worm gears allows them to withstand weighty hundreds without slipping or tearing out of the worm. A double-throat worm gear offers the tightest connection amongst worm and gear, and is for that reason excellent for hoisting applications. The self-locking character of the worm equipment is one more edge. If the worm gears are designed well, they are outstanding for minimizing speeds, as they are self-locking.
When selecting a worm, the amount of threads that a worm has is essential. Thread starts off establish the reduction ratio of a pair, so the increased the threads, the increased the ratio. The same is correct for the worm helix angles, which can be 1, two, or a few threads lengthy. This differs between a single thread and a double-throat worm equipment, and it is critical to think about the helix angle when choosing a worm.
Double-throat worm gears vary in their profile from the true gear. Double-throat worm gears are specifically useful in purposes exactly where sound is an situation. In addition to their lower noise, worm gears can soak up shock hundreds. A double-throat worm gear is also a popular decision for several various sorts of applications. These gears are also frequently used for hoisting tools. Its tooth profile is distinct from that of the real equipment.
worm shaft

Bronze or aluminum worm shafts

When selecting a worm, a number of things ought to be held in thoughts. The content of the shaft must be possibly bronze or aluminum. The worm itself is the major part, but there are also addendum gears that are offered. The complete amount of teeth on equally the worm and the addendum equipment need to be increased than forty. The axial pitch of the worm wants to match the round pitch of the larger equipment.
The most common content utilized for worm gears is bronze since of its appealing mechanical qualities. Bronze is a broad expression referring to a variety of copper alloys, like copper-nickel and copper-aluminum. Bronze is most typically produced by alloying copper with tin and aluminum. In some circumstances, this mixture results in brass, which is a comparable metallic to bronze. The latter is less pricey and suitable for mild hundreds.
There are many advantages to bronze worm gears. They are robust and resilient, and they supply outstanding dress in-resistance. In distinction to steel worms, bronze worm gears are quieter than their counterparts. They also demand no lubrication and are corrosion-resistant. Bronze worms are well-known with modest, light-weight-fat equipment, as they are straightforward to keep. You can go through a lot more about worm gears in CZPT’s CZPT.
Though bronze or aluminum worm shafts are the most frequent, equally materials are equally suitable for a variety of programs. A bronze shaft is frequently called bronze but might actually be brass. Traditionally, worm gears were made of SAE 65 equipment bronze. Even so, newer supplies have been released. SAE sixty five equipment bronze (UNS C90700) continues to be the preferred material. For higher-volume applications, the substance cost savings can be significant.
Both sorts of worms are primarily the same in dimensions and shape, but the guide on the left and appropriate tooth surfaces can range. This makes it possible for for precise adjustment of the backlash on a worm without changing the centre distance between the worm equipment. The various dimensions of worms also make them less difficult to manufacture and maintain. But if you want an specifically modest worm for an industrial software, you ought to think about bronze or aluminum.

Calculation of worm shaft deflection

The centre-line distance of a worm gear and the quantity of worm teeth perform a critical function in the deflection of the rotor. These parameters need to be entered into the instrument in the same units as the major calculation. The chosen variant is then transferred to the principal calculation. The deflection of the worm gear can be calculated from the angle at which the worm tooth shrink. The subsequent calculation is beneficial for creating a worm equipment.
Worm gears are commonly utilised in industrial applications thanks to their substantial transmittable torques and large equipment ratios. Their difficult/soft substance blend makes them ideally suited for a vast range of purposes. The worm shaft is usually produced of scenario-hardened steel, and the worm wheel is fabricated from a copper-tin-bronze alloy. In most situations, the wheel is the region of contact with the equipment. Worm gears also have a minimal deflection, as higher shaft deflection can have an effect on the transmission precision and increase use.
An additional method for determining worm shaft deflection is to use the tooth-dependent bending stiffness of a worm gear’s toothing. By calculating the stiffness of the specific sections of a worm shaft, the stiffness of the total worm can be identified. The approximate tooth area is proven in figure 5.
An additional way to calculate worm shaft deflection is by employing the FEM strategy. The simulation tool utilizes an analytical model of the worm equipment shaft to figure out the deflection of the worm. It is based on a two-dimensional model, which is more ideal for simulation. Then, you need to have to input the worm gear’s pitch angle and the toothing to estimate the greatest deflection.
worm shaft

Lubrication of worm shafts

In get to defend the gears, worm drives require lubricants that provide outstanding anti-use security, high oxidation resistance, and reduced friction. Even though mineral oil lubricants are broadly utilized, synthetic base oils have much better overall performance characteristics and decrease operating temperatures. The Arrhenius Rate Rule states that chemical reactions double every single ten levels C. Artificial lubricants are the best choice for these programs.
Synthetics and compounded mineral oils are the most well-liked lubricants for worm gears. These oils are formulated with mineral basestock and four to 6 % artificial fatty acid. Surface-energetic additives give compounded equipment oils exceptional lubricity and stop sliding dress in. These oils are suited for large-pace purposes, including worm gears. However, artificial oil has the downside of being incompatible with polycarbonate and some paints.
Artificial lubricants are pricey, but they can increase worm equipment efficiency and functioning daily life. Synthetic lubricants normally fall into two types: PAO synthetic oils and EP artificial oils. The latter has a higher viscosity index and can be utilised at a selection of temperatures. Synthetic lubricants often contain anti-wear additives and EP (anti-wear).
Worm gears are often mounted above or beneath the gearbox. The suitable lubrication is vital to ensure the right mounting and operation. Frequently, inadequate lubrication can trigger the device to fail faster than envisioned. Since of this, a technician may possibly not make a link among the lack of lube and the failure of the unit. It is essential to comply with the manufacturer’s tips and use large-good quality lubricant for your gearbox.
Worm drives lessen backlash by reducing the engage in between equipment teeth. Backlash can lead to hurt if unbalanced forces are released. Worm drives are light-weight and tough because they have minimum relocating components. In addition, worm drives are low-sounds and vibration. In addition, their sliding movement scrapes absent surplus lubricant. The consistent sliding action generates a substantial quantity of heat, which is why outstanding lubrication is critical.
Oils with a high movie strength and excellent adhesion are best for lubrication of worm gears. Some of these oils incorporate sulfur, which can etch a bronze gear. In buy to keep away from this, it is critical to use a lubricant that has large film energy and helps prevent asperities from welding. The excellent lubricant for worm gears is a single that provides excellent film strength and does not incorporate sulfur.

China Good quality High Quality PPR PP-R Worm Gear Butterfly Valve Fr-PP FRPP Wafer Industrial Butterfly Valve Lever PP PPG PVC Butterfly Control Valve DIN ANSI JIS Standard     with Good qualityChina Good quality High Quality PPR PP-R Worm Gear Butterfly Valve Fr-PP FRPP Wafer Industrial Butterfly Valve Lever PP PPG PVC Butterfly Control Valve DIN ANSI JIS Standard     with Good quality