Tag Archives: water gear

China best High Quality Plastic Thermoplastic Sanitary Flange Butterfly Valve PVC Wafer Type Worm Gear Butterfly Valve PVC Water CZPT Manual Handle Butterfly Valve Lever with Hot selling

Solution Description

Higher High quality

Plastic Thermoplastic Sanitary Flange Butterfly Valve
PVC Wafer Variety Worm Gear Butterfly Valve
PVC H2o CZPT Handbook Take care of Butterfly Valve Lever
DIN ANSI JIS Standard
DN50-DN400 ( 2″-16″ )

PVC Butterfly Valve for Water Supply DIN ANSI JIS Standard
DN.50mm to DN.400mm

Features
Water Supply
Material : PVC-U
Standard : DIN ANSI JIS Standard
Connection : Flange
SIZE : DN50 ( 63mm ) 2″ ~ DN400 (400mm ) 16″
Working Pressure : 150PSI 1.0 MPa
                                   100PSI  0.6MPa
Color : Dark
Grey

PVC Butterfly Valve ( Stage & Equipment )

FRPP Butterfly Valve  ( Degree & Gear )

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

 

PVC  Thermoplastic  Butterfly Valve DIN, ANSI, JIS Common
DN50-DN400 ( 2″-16″ )
 

 With Carbon Steel Stem #forty five. Disc with PVC.  Seat & O-Ring with EPDM Rubber.          

  With Stainless Steel Stem # 304.  Disc with PVC.  Seat & O-Ring with EPDM Rubber     

With Stainless Steel  Stem # 316.  Disc with PVC.  Seat & O-Ring with EPDM Rubber

With Stainless Steel  Stem # 304.  Disc with PVC.  Seat & O-Ring with FPM Rubber

With Stainless Steel  Stem #316.  Disc with PVC  Seat & O-Ring with FPM Rubber.

PVC-U FRPP Butterfly Valve for Electric powered & Pneumatic Actuator Usage
DN50-DNfour00 ( 2″- 16” )

DN50 – DN150 (2″- 6″) 100PSI PN0.8MPa  
DN200-DN300 (8″- 12″) 80PSI  PN0.5MPa
DN350-DN400 (fourteen”- sixteen”) 60PSI  PN0.4MPa

Common:  DIN, ANSI, JIS Common      
Hello-Top quality   Low Torque   Acid-Evidence   Alkali-Proof   100% Test

Can be Custom-made
Distinct Measurements Shaft of Square, Oblate, Round Keyway

Heavy the Valve Entire body, Thicken the Valve Plate
Thicken the Valve Stem, the Valve Stem Restrict

With Carbon Metal Stem #forty five & 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 Body

Actuator Mounting Gap
with ISO5211 Regular With out Bracket, Immediate Connection

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

Working Force:  
DN50-DN150 ( 2″- 6″ ) 150PSI  PN1.0MPa
DN200 ( 8″ ) 90PSI  PN0.6MPa   
                                  
Standard: DIN, ANSI, JIS Common
Hello-Top quality, Reduced Torque, Lockable, Acid-Proof, Alkali-Evidence, one hundred% Check

PVC Butterfly Valve Patent Engineering
Enhance the Locking Gap to Lock the Valve

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

PVC-U FRPP Butterfly Valve ( Gear Kind ) DN50-DN400 ( 2″- 16″ )

DN50-DN200 (2″- 8″) 150PSI PN1.0MPa  
DN250-DN300 (10″- twelve”) 90PSI  PN0.6MPa
DN350-DN400 (14″- sixteen”) 60PSI  PN0.4MPa

Standard:  DIN, ANSI, JIS Common      
Hello-Quality   Low Torque   Acid-Proof   Alkali-Proof   100% Examination

              Hygienic Stage PVC Uncooked Content Injection              
Gear Box and Hand Wheel Can Be Made of Plastic

Built-in Framework of Valve Seat and Valve Body

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

Worm Shafts and Gearboxes

If you have a gearbox, you may possibly be questioning what the best Worm Shaft is for your software. There are a number of factors to think about, including the Concave form, Variety of threads, and Lubrication. This write-up will describe each and every issue and aid you select the correct Worm Shaft for your gearbox. There are several possibilities obtainable on the market, so don’t hesitate to store around. If you are new to the world of gearboxes, read through on to learn more about this common sort of gearbox.
worm shaft

Concave condition

The geometry of a worm gear may differ substantially dependent on its company and its intended use. Early worms had a standard profile that resembled a screw thread and could be chased on a lathe. Later on, resources with a straight sided g-angle were developed to make threads that had been parallel to the worm’s axis. Grinding was also developed to boost the complete of worm threads and reduce distortions that take place with hardening.
To choose a worm with the appropriate geometry, the diameter of the worm gear need to be in the exact same device as the worm’s shaft. When the standard profile of the worm equipment is established, the worm equipment enamel can be specified. The calculation also involves an angle for the worm shaft to prevent it from overheating. The angle of the worm shaft ought to be as close to the vertical axis as feasible.
Double-enveloping worm gears, on the other hand, do not have a throat close to the worm. They are helical gears with a straight worm shaft. Because the tooth of the worm are in make contact with with each other, they produce substantial friction. As opposed to double-enveloping worm gears, non-throated worm gears are a lot more compact and can deal with scaled-down hundreds. They are also easy to manufacture.
The worm gears of diverse makers offer you a lot of positive aspects. For occasion, worm gears are one particular of the most productive ways to enhance torque, even though lower-top quality components like bronze are tough to lubricate. Worm gears also have a lower failure charge simply because they enable for significant leeway in the style process. Regardless of the distinctions among the two specifications, the general performance of a worm equipment technique is the same.
The cone-shaped worm is another type. This is a technological plan that brings together a straight worm shaft with a concave arc. The concave arc is also a valuable utility product. Worms with this condition have far more than a few contacts at the very same time, which signifies they can reduce a huge diameter with out too much put on. It is also a relatively low-value model.
worm shaft

Thread sample

A very good worm equipment demands a perfect thread sample. There are a handful of crucial parameters that establish how very good a thread sample is. To start with, the threading pattern need to be ACME-threaded. If this is not possible, the thread should be manufactured with straight sides. Then, the linear pitch of the “worm” need to be the identical as the circular pitch of the corresponding worm wheel. In easy terms, this indicates the pitch of the “worm” is the exact same as the circular pitch of the worm wheel. A quick-change gearbox is generally utilized with this variety of worm equipment. Alternatively, lead-screw alter gears are employed rather of a rapid-adjust gear box. The pitch of a worm gear equals the helix angle of a screw.
A worm gear’s axial pitch must match the circular pitch of a gear with a higher axial pitch. The circular pitch is the length in between the details of teeth on the worm, whilst the axial pitch is the length amongst the worm’s enamel. Yet another factor is the worm’s direct angle. The angle in between the pitch cylinder and worm shaft is called its direct angle, and the greater the lead angle, the greater the effectiveness of a equipment.
Worm equipment tooth geometry differs dependent on the company and intended use. In early worms, threading resembled the thread on a screw, and was very easily chased utilizing a lathe. Afterwards, grinding improved worm thread finishes and minimized distortions from hardening. As a end result, nowadays, most worm gears have a thread sample corresponding to their size. When choosing a worm gear, make certain to examine for the amount of threads just before purchasing it.
A worm gear’s threading is critical in its operation. Worm enamel are usually cylindrical, and are organized in a sample comparable to screw or nut threads. Worm enamel are often formed on an axis of perpendicular in comparison to their parallel counterparts. Due to the fact of this, they have better torque than their spur gear counterparts. Furthermore, the gearing has a low output velocity and large torque.

Number of threads

Various kinds of worm gears use distinct figures of threads on their planetary gears. A solitary threaded worm gear ought to not be employed with a double-threaded worm. A solitary-threaded worm gear ought to be employed with a one-threaded worm. Solitary-threaded worms are much more successful for speed reduction than double-threaded kinds.
The amount of threads on a worm’s shaft is a ratio that compares the pitch diameter and amount of teeth. In standard, worms have 1,2,4 threads, but some have 3, 5, or 6. Counting thread commences can help you decide the number of threads on a worm. A single-threaded worm has much less threads than a numerous-threaded worm, but a multi-threaded worm will have more threads than a mono-threaded planetary gear.
To evaluate the variety of threads on a worm shaft, a little fixture with two floor faces is used. The worm need to be eliminated from its housing so that the completed thread area can be inspected. Right after figuring out the variety of threads, basic measurements of the worm’s exterior diameter and thread depth are taken. After the worm has been accounted for, a cast of the tooth room is produced using epoxy materials. The casting is moulded amongst the two tooth flanks. The V-block fixture rests towards the outside diameter of the worm.
The round pitch of a worm and its axial pitch have to match the round pitch of a more substantial gear. The axial pitch of a worm is the distance among the points of the teeth on a worm’s pitch diameter. The lead of a thread is the distance a thread travels in a single revolution. The guide angle is the tangent to the helix of a thread on a cylinder.
The worm gear’s speed transmission ratio is dependent on the number of threads. A worm equipment with a substantial ratio can be simply reduced in 1 step by employing a established of worm gears. Even so, a multi-thread worm will have more than two threads. The worm equipment is also more successful than solitary-threaded gears. And a worm equipment with a higher ratio will permit the motor to be utilised in a variety of purposes.
worm shaft

Lubrication

The lubrication of a worm gear is notably difficult, because of to its friction and substantial sliding make contact with pressure. Luckily, there are many possibilities for lubricants, such as compounded oils. Compounded oils are mineral-based mostly lubricants formulated with ten % or far more fatty acid, rust and oxidation inhibitors, and other additives. This mixture benefits in enhanced lubricity, lowered friction, and reduced sliding put on.
When picking a lubricant for a worm shaft, make certain the product’s viscosity is proper for the type of gearing utilised. A low viscosity will make the gearbox difficult to actuate and rotate. Worm gears also undergo a greater sliding movement than rolling motion, so grease have to be ready to migrate evenly through the gearbox. Repeated sliding motions will thrust the grease absent from the make contact with zone.
Yet another consideration is the backlash of the gears. Worm gears have higher equipment ratios, at times three hundred:1. This is critical for power purposes, but is at the same time inefficient. Worm gears can generate heat during the sliding motion, so a high-high quality lubricant is crucial. This variety of lubricant will decrease warmth and make certain optimum overall performance. The pursuing ideas will assist you select the right lubricant for your worm gear.
In reduced-speed programs, a grease lubricant might be sufficient. In higher-speed applications, it truly is best to utilize a synthetic lubricant to prevent untimely failure and tooth dress in. In each cases, lubricant decision relies upon on the tangential and rotational velocity. It is essential to stick to manufacturer’s recommendations concerning the decision of lubricant. But bear in mind that lubricant decision is not an easy activity.

China best High Quality Plastic Thermoplastic Sanitary Flange Butterfly Valve PVC Wafer Type Worm Gear Butterfly Valve PVC Water CZPT Manual Handle Butterfly Valve Lever     with Hot sellingChina best High Quality Plastic Thermoplastic Sanitary Flange Butterfly Valve PVC Wafer Type Worm Gear Butterfly Valve PVC Water CZPT Manual Handle Butterfly Valve Lever     with Hot selling

China Hot selling High Quality Plastic Non Actuator Butterfly Valves PVC Wafer Type Butterfly Valves UPVC Worm Gear Flange Butterfly Valves DIN ANSI JIS Standard for Water Supply with Great quality

Product Description

Higher Quality

Plastic Non Actuator Butterfly Valves
PVC Wafer Sort Butterfly Valves
UPVC Worm Gear Flange Butterfly Valves
DIN ANSI JIS Common for H2o Supply 

PVC Butterfly Valve DIN, ANSI, JIS Normal
DN50-DN400 ( 2″-sixteen” ).

PVC Butterfly Valve ( Degree & Equipment )

FRPP Butterfly Valve  ( Stage & Gear )

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

 

PVC Butterfly Valve for Water Supply DIN ANSI JIS Standard
DN.50mm to DN.400mm

Characteristics
Water Supply
Material : PVC-U
Standard : DIN ANSI JIS Standard
Connection : Flange
SIZE : DN50 ( 63mm ) 2″ ~ DN400 (400mm ) 16″
Working Pressure : 150PSI 1.0 MPa
                                   100PSI  0.6MPa
Color : Dark
Gray

PVC-U FRPP Butterfly Valve for Electric powered & Pneumatic Actuator Use
DN50-DN400 ( 2″- onesix” )

DN50 – DN150 (2″- 6″) 100PSI PN0.8MPa  
DN200-DN300 (8″- 12″) 80PSI  PN0.5MPa
DN350-DN400 (14″- sixteen”) 60PSI  PN0.4MPa

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

Can be Customized
Distinct Measurements Shaft of Square, Oblate, Round Keyway

Weighty the Valve Human body, Thicken the Valve Plate
Thicken the Valve Stem, the Valve Stem Restrict

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

Integrated Framework of Valve Seat and Valve Body

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

PVC-U FRPP Butterfly Valve ( Lever Type ) DN50-DN200 ( 2″- 8″ )

Operating Stress:  
DN50-DN150 ( 2″- 6″ ) 150PSI  PN1.0MPa
DN200 ( 8″ ) 90PSI  PN0.6MPa   
                                  
Standard: DIN, ANSI, JIS Normal
Hello-High quality, Low Torque, Lockable, Acid-Proof, Alkali-Evidence, a hundred% Examination

PVC Butterfly Valve Patent Technology
Increase the Locking Gap to Lock the Valve

Integrated Structure of Valve Seat and Valve Physique.                                                                                                      
Large the Valve Physique, Thicken the Valve Plate
Thicken the Valve Stem, the Valve Stem Limit
  
With Carbon Metal Stem #forty five & EPDM Rubber
With Stainless Steel Stem #304 & EPDM / FPM Rubber
With Stainless Steel  Stem #316 & EPDM / FPM Rubber
Lengthier & Wider Handle,Manage Lever Larger, Work Operation

PVC-U FRPP Butterfly Valve ( Gear Type ) DN50-DN400 ( 2″- 16″ )

DN50-DN200 (2″- 8″) 150PSI PN1.0MPa  
DN250-DN300 (ten”- twelve”) 90PSI  PN0.6MPa
DN350-DN400 (14″- 16″) 60PSI  PN0.4MPa

Regular:  DIN, ANSI, JIS Common      
Hello-Good quality   Low Torque   Acid-Evidence   Alkali-Evidence   100% Take a look at

              Hygienic Amount PVC Raw Material Injection              
Equipment Box and Hand Wheel Can Be Created of Plastic

Built-in Composition of Valve Seat and Valve Physique

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

What Are Worm Gears and Worm Shafts?

If you happen to be seeking for a fishing reel with a worm gear program, you’ve almost certainly appear throughout the expression ‘worm gear’. But what are worm gears and worm shafts? And what are the positive aspects and negatives of worm gears? Let us take a nearer search! Read through on to learn much more about worm gears and shafts! Then you are going to be nicely on your way to acquiring a reel with a worm equipment system.
worm shaft

worm equipment reducers

Worm shaft reducers have a amount of advantages above standard equipment reduction mechanisms. Very first, they’re hugely efficient. Even though solitary phase worm reducers have a greatest reduction ratio of about five to sixty, hypoid gears can normally go up to a maximum of a single hundred and twenty occasions. A worm shaft reducer is only as productive as the gearing it utilizes. This article will examine some of the advantages of employing a hypoid equipment set, and how it can gain your enterprise.
To assemble a worm shaft reducer, first get rid of the flange from the motor. Then, take away the output bearing carrier and output equipment assembly. Lastly, set up the intermediate worm assembly by means of the bore reverse to the attachment housing. When mounted, you must carefully take away the bearing provider and the equipment assembly from the motor. Do not neglect to get rid of the oil seal from the housing and motor flange. For the duration of this method, you have to use a modest hammer to faucet around the confront of the plug around the outdoors diameter of the housing.
Worm gears are frequently employed in reversing avoidance techniques. The backlash of a worm gear can increase with wear. However, a duplex worm equipment was developed to tackle this dilemma. This variety of equipment requires a scaled-down backlash but is nevertheless highly precise. It makes use of distinct leads for the opposing tooth face, which continuously alters its tooth thickness. Worm gears can also be modified axially.

worm gears

There are a pair of various kinds of lubricants that are utilized in worm gears. The initial, polyalkylene glycols, are utilized in instances exactly where large temperature is not a problem. This kind of lubricant does not incorporate any waxes, which tends to make it an outstanding choice in minimal-temperature apps. However, these lubricants are not compatible with mineral oils or some kinds of paints and seals. Worm gears normally characteristic a steel worm and a brass wheel. The brass wheel is a lot easier to rework than steel and is usually modeled as a sacrificial part.
The worm gear is most efficient when it is used in small and compact apps. Worm gears can drastically improve torque or reduce pace, and they are usually utilized exactly where room is an problem. Worm gears are between the smoothest and quietest equipment systems on the market, and their meshing effectiveness is outstanding. Even so, the worm gear requires large-high quality manufacturing to perform at its optimum amounts. If you happen to be thinking about a worm gear for a undertaking, it truly is crucial to make confident that you locate a maker with a prolonged and high quality popularity.
The pitch diameters of both worm and pinion gears need to match. The two worm cylinders in a worm wheel have the very same pitch diameter. The worm wheel shaft has two pitch cylinders and two threads. They are equivalent in pitch diameter, but have different advancing angles. A self-locking worm equipment, also known as a wormwheel, is generally self-locking. Additionally, self-locking worm gears are straightforward to install.

worm shafts

The deflection of worm shafts differs with toothing parameters. In addition to toothing length, worm equipment measurement and stress angle, worm gear size and variety of helical threads are all influencing variables. These variants are modeled in the regular ISO/TS 14521 reference equipment. This desk exhibits the variations in each parameter. The ID implies the worm shaft’s middle length. In addition, a new calculation technique is offered for identifying the equivalent bending diameter of the worm.
The deflection of worm shafts is investigated utilizing a four-phase process. First, the finite factor method is used to compute the deflection of a worm shaft. Then, the worm shaft is experimentally analyzed, evaluating the final results with the corresponding simulations. The closing stage of the simulation is to think about the toothing geometry of 15 various worm equipment toothings. The outcomes of this action affirm the modeled final results.
The direct on the correct and still left tooth surfaces of worms is the exact same. However, the direct can be diverse alongside the worm shaft. This is named twin lead worm equipment, and is employed to eliminate engage in in the major worm gear of hobbing machines. The pitch diameters of worm modules are equal. The identical principle applies to their pitch diameters. Normally, the direct angle increases as the variety of threads decreases. Consequently, the bigger the direct angle, the less self-locking it turns into.
worm shaft

worm gears in fishing reels

Fishing reels generally contain worm shafts as a portion of the building. Worm shafts in fishing reels allow for uniform worm winding. The worm shaft is attached to a bearing on the rear wall of the reel device through a gap. The worm shaft’s entrance finish is supported by a concave gap in the front of the reel device. A typical fishing reel may also have a worm shaft hooked up to the sidewall.
The gear support part 29 supports the rear finish of the pinion gear 12. It is a thick rib that protrudes from the lid portion 2 b. It is mounted on a bushing 14 b, which has a via hole by way of which the worm shaft twenty passes. This worm gear supports the worm. There are two kinds of worm gears accessible for fishing reels. The two sorts of worm gears could have distinct quantity of teeth or they may possibly be the exact same.
Standard worm shafts are manufactured of stainless metal. Stainless metal worm shafts are particularly corrosion-resistant and resilient. Worm shafts are utilized on spinning reels, spin-casting reels, and in many electrical equipment. A worm shaft can be reversible, but it is not fully dependable. There are many benefits of worm shafts in fishing reels. These fishing reels also attribute a line winder or amount winder.

worm gears in electrical equipment

Worms have diverse tooth shapes that can support increase the load carrying capability of a worm gear. Diverse tooth styles can be utilised with circular or secondary curve cross sections. The pitch point of the cross section is the boundary for this sort of mesh. The mesh can be either good or negative relying on the wanted torque. Worm enamel can also be inspected by measuring them more than pins. In a lot of cases, the guide thickness of a worm can be adjusted making use of a equipment tooth caliper.
The worm shaft is mounted to the reduce scenario segment 8 through a rubber bush thirteen. The worm wheel 3 is connected to the joint shaft 12. The worm 2 is coaxially connected to the shaft end segment 12a. This joint shaft connects to a swing arm and rotates the worm wheel 3.
The backlash of a worm gear might be elevated if the worm is not mounted effectively. To correct the issue, makers have designed duplex worm gears, which are ideal for small backlash programs. Duplex worm gears employ different qualified prospects on every tooth experience for steady modify in tooth thickness. In this way, the center distance of the worm gear can be modified without having altering the worm’s design and style.

worm gears in engines

Making use of worm shafts in engines has a number of positive aspects. 1st of all, worm gears are quiet. The equipment and worm encounter go in opposite directions so the strength transferred is linear. Worm gears are popular in programs where torque is crucial, this sort of as elevators and lifts. Worm gears also have the edge of currently being created from gentle materials, producing them simple to lubricate and to use in apps the place noise is a issue.
Lubricants are essential for worm gears. The viscosity of lubricants establishes whether the worm is ready to contact the equipment or wheel. Common lubricants are ISO 680 and 460, but larger viscosity oil is not uncommon. It is crucial to use the proper lubricants for worm gears, considering that they cannot be lubricated indefinitely.
Worm gears are not recommended for engines due to their restricted efficiency. The worm gear’s spiral motion brings about a significant reduction in room, but this calls for a substantial quantity of lubrication. Worm gears are susceptible to breaking down simply because of the tension positioned on them. Additionally, their limited velocity can lead to substantial damage to the gearbox, so careful servicing is vital. To make positive worm gears remain in leading problem, you should inspect and clean them regularly.
worm shaft

Approaches for producing worm shafts

A novel method to manufacturing worm shafts and gearboxes is provided by the approaches of the current invention. Elements of the strategy require producing the worm shaft from a typical worm shaft blank obtaining a defined outer diameter and axial pitch. The worm shaft blank is then tailored to the wanted equipment ratio, resulting in a gearbox family members with multiple equipment ratios. The desired technique for producing worm shafts and gearboxes is outlined under.
A worm shaft assembly process might require establishing an axial pitch for a given body size and reduction ratio. A one worm shaft blank generally has an outer diameter of one hundred millimeters, which is the measurement of the worm equipment set’s heart length. On completion of the assembly procedure, the worm shaft has the sought after axial pitch. Methods for producing worm shafts contain the subsequent:
For the style of the worm equipment, a high degree of conformity is necessary. Worm gears are labeled as a screw pair in the reduce pairs. Worm gears have large relative sliding, which is advantageous when evaluating them to other types of gears. Worm gears require very good surface area complete and rigid positioning. Worm gear lubrication usually comprises surface energetic additives these kinds of as silica or phosphor-bronze. Worm equipment lubricants are usually mixed. The lubricant movie that kinds on the gear enamel has minor impact on wear and is typically a great lubricant.

China Hot selling High Quality Plastic Non Actuator Butterfly Valves PVC Wafer Type Butterfly Valves UPVC Worm Gear Flange Butterfly Valves DIN ANSI JIS Standard for Water Supply     with Great qualityChina Hot selling High Quality Plastic Non Actuator Butterfly Valves PVC Wafer Type Butterfly Valves UPVC Worm Gear Flange Butterfly Valves DIN ANSI JIS Standard for Water Supply     with Great quality