Threaded Gate Valve: The Ultimate FAQ Guide

This guide will answer all questions you have about threaded gate valve.

Whether you want to lean about type of threads, components, working principle, maintenance process, or applications – you will find all information right here.

Keep reading to learn more.

What Is Threaded Gate Valve?

threaded gate valve

threaded gate valve

They can be defined based on two criteria, i.e.

  1. Typically, they are threaded gate valves with a threaded end connection type.
    This means that the piping system’s male threads fit into the female threads of the threaded gate valve.
  • The threaded gate valves can have either a female end connection, a male connection, or one of each on either end.
  • To be qualified as useful and applicable, threaded gate valves must conform to a set of standards.
    For example, the piping and the threaded gate valve must be constructed according to a similar standard to connect properly.
  • Two types of threads apply to threaded gate valves, i.e., straight threads and tapered threads.
    The latter will provide your process with fluid-tight sealing without auxiliary components like a flat washer.
    The straight threads, on the other hand, will require an additional seal.
  1. Threaded gate valves are classified as non rising stem valves or rising stem valves.
    The stem component is usually threaded into the valve body.
    This means that the gate will move down or up the stem if you rotate the stems handwheel.
  • The stem stays stationary on the vertical axis as the gate moves on the threads.
  • There is almost always an indicator that represents the gate position. It is threaded into the stem’s upper end and is relatively easy to notice.

What Are The Applications Of Threaded Gate Valves?

You can use threaded gate valves in applications and processes that require minimal flow restriction or straight flows.

The gate, i.e., a sliding plate, will permit or limit fluid and media flow through the gate valve.

Primarily, you can use threaded gate valves in applications like petrochemical industries and refineries.

Such applications are often characterized by extremely high temperatures and relatively low pressure rates.

You can also use threaded gate valves in gas or oil production applications.

These applications are characterized by extreme environmental conditions, long closing/opening times, and high pressure rates.

A threaded gate valve will thrive and perform excellently in such requisite conditions.

How Does A Threaded Gate Valve Work?

The gate component of a threaded gate valve is a sliding plate.

When you actuate it, the gate will slide to permit or limit full fluid flow through the gate valve.

Besides, the gate will come into contact with the bonnet of the threaded gate valve.

This would mean that there is no restriction to fluid flow because it would be fully open.

Also, the stem acts as an actuator, and it works by the following principle:-

The stem component is usually threaded into the valve body.

This means that the gate will move down or up the stem if you rotate the stems handwheel.

The stem stays stationary on the vertical axis as the gate moves on the threads.

There is almost always an indicator that represents the gate position. It is threaded into the stem’s upper end and is relatively easy to notice.

How Do You Install Threaded Gate Valves?

You should install the threaded gate valve in such a manner that it will ensure the stem is above the horizontal line.

This will prevent problems like the accumulation of debris in the bonnet due to incomplete drainage.

In the long run, improperly installed threaded gate valves will have shortened lifespans and inefficient operation.

This can slow down your process, and you may end up running losses.

What Is The Difference Between Threaded And Flanged Gate Valves?

Threaded gate valves are very popular.

Typically, they are threaded gate valves with a threaded end connection type.

This means that the piping system’s male threads fit into the female threads of the threaded gate valve.

The threaded gate valves can have either a female end connection, a male connection, or one of each on either end.

Two types of threads apply to threaded gate valves, i.e., straight threads and tapered threads.

Besides, the latter will provide your process with fluid-tight sealing without auxiliary components like a flat washer.

The straight threads, on the other hand, will require an additional seal.

A flanged gate valve involves attaching the gate valve and piping using an external or internal lip at its most basic level.

To prevent leakages, a gasket is placed between the gate valve and the pipe at the point of connection.

flanged gate valve

flanged gate valve

 Afterward, they have sealed tight using bolts.

They are available in many types, i.e., socket weld flanges, weld neck flanges, lap joint flanges, and slip-on flanges.

These may prove confusing. However, they provide your process with a wide variety of application options.

Flanged gate valves work great with hazardous media, high joint integrity applications, constricted or open areas, and different pipe sizes.

What Are The Benefits Of Using Threaded Gate Valves?

The notable advantages of threaded gate valves to the processes they are used in are:-

  • You can apply them in demanding applications such as high pressure and high temperature applications.
  • They have leakage integrity which is well suited to low temperature and pressure applications which encounter little vibration.
  • They do not require special skills to install, at least not extensively. That said, they bring high installation productivity rates.

What Materials Are Threaded Gate Valves Made From?

You can use threaded gate valves in many applications and environments where they may come into contact with different media.

Before you choose a threaded gate valve, be sure to take the construction material into account. This is because construction materials are a crucial factor that significantly influences the efficiency of your process.

Threaded gate valves are typically constructed from forged steel, steel alloys, stainless steel, ductile iron, and cast iron, etc.

These materials are specified by the NACE and API, i.e., National allowance Association for Corrosion Engineers and American Petroleum Institute.

These standards present requirements that materials must meet before being qualified as useful in handling corrosive and strong media.

What Are The Disadvantages Of Using Threaded Gate Valves?

The limitations of using threaded gate valves are as follows:

  • They respond very slowly since they require you to turn the handwheel multiple times to open fully and vice versa.
    Because of this, you should not use them in oil and gas applications that require fast closing and opening times.
  • Avoid threaded gate valves in applications that are hazardous. They are significantly vulnerable to fatigue and damage.
    Especially if they are made from materials that are not resistant to corrosion.
  • Threaded gate valves are badly affected by vibration.
  • Rapid temperature variations may result in leakages. Thermal expansion rates between the valve and the piping may differ.

Can You Use Threaded Gate Valve To Regulate Flow Or Throttle?

Yes, you can use threaded gate valves to regulate flow or throttle, albeit at very minimal rates.

The open valve is not proportional to the rate of fluid flow. Hence, you can’t use them to regulate flow.

Threaded gate valves are designed to be block valves and not control valves.

Their design might suffer damages in the form of disk and seat erosion and tight faces loosening.

Even in the fully open position, threaded gate valves will offer low flow resistance.

Moreover, one that is not fully open may move from its designated place due to vibrations.

This may destroy the seat and gate components.

Can You Install Threaded Gate Valve At The End Of The Pipeline?

Unfortunately, you cannot install threaded gate valves at the end of piping systems. They are meant to act as block valves and not faucets.

This is because they have very low pressure ratings and may be subject to premature damage if used in such applications.

What Are The Primary Components Of Threaded Gate Valve?

Threaded gate valves consist of three primary components, i.e., the trim, bonnet, and body. All these components are connected.

Bonnet

This component contains all the parts of the threaded gate valve that move.

They are attached using bolts to allow for easy and fast maintenance procedures.

The bonnet is removable, meaning you can remove it if you want to replace, maintain or clean any parts.

The threaded gate valve’s trim has the following parts; Seat rings, wedge or disc, the gate, and the stem.

Stem

The threaded gate valve’s stem can be the non rising or rising stem. Its primary purpose is to ensure that the disc is positioned correctly.

If it is a non rising type, the valve position indicator will be located on its upper end.

This prevents debris and dirt from being carried into the packing by the threads.

Seat

The seat of a threaded gate valve is an essential part of the trim. It can be in a configuration similar to a seat ring or be integrated with the body.

It can also be pressed or threaded into position or welded.

Welded and pressed seats are applicable in applications that require high temperature ratings.

How Do You Maintain Threaded Gate Valve?

Threaded gate valves need regular maintenance to keep working properly.

Some kinds of valves are difficult to maintain, while others, like threaded valves, can easily be opened and cleaned/repaired.

Here are some tips on how to maintain threaded gate valves:

  • If it calls for it, replace the gate or wedge by removing the stem and bonnet.
    Remove the wedge and replace it before reinstalling and refitting.
  • You can remove the threaded gate valve from the piping system for repairs by following the installation sequence in reverse.
  • You should relieve all system pressure prior to conducting any maintenance sequences.
  • If you do not use the gate valve regularly, ensure that it is cycled at least once every month.

During storage:

You should unpack the valves only when they are ready for installation.

Doing this will protect them from debris and dust. Debris and dust may, in the long run, cause valve failure and result in leakage.

If you store it for extended periods, you should consider keeping it in a cool and ventilated space.

Also, inspect the valve for any missing parts.

How Much Do Threaded Gate Valves Cost?

It is undoubtedly true that product safety and quality are the top priorities for you, the buyers, and the equipment industry in general.

Here, we offer an excellent chance to acquire threaded gate valves which are reliable, efficient, and high performance.

We do all this at a reasonable price point ranging between 45 and 100 dollars without compromising the above-mentioned parameters.

What Are The Available Sizes For Threaded Gate Valves?

Threaded gate valves come in the following sizes, i.e., ½ inch to 3 inches.

What Are The Temperature And Pressure Ratings Of Threaded Gate Valves?

Threaded gate valves are typically constructed from materials like carbon steel, forged alloys, cast bronze or brass, and malleable iron.

These materials are classified under CLASS 6000, 3000, and 2000 psi as posited by ASME B16.11.

ASME B16.11 are standards that contain the test and qualification standards that threaded gate valves must meet to be considered useful.

Their temperature range lies between -20° C and 180° C.

These pressure ratings are primarily affected by the type of materials used and the overall design of the threaded valve.

What Are The Critical Features Of Threaded Gate Valves?

  • The threaded gate valves come with a handwheel for operation.
  • The threaded gate valves have a pressure rating of 600 psi.
  • They have Polytetrafluoroethylene seals and are manufactured from robust materials like stainless steel.
  • Also, they come in sizes 3″ to ½. “
  • They have BSPP, BSPT, or NPT threaded ends.
  • Besides, they are well suited for aggressive chemicals, fluids, and industrial applications.

What Test And Qualification Standards Do Threaded Gate Valves Conform To?

Threaded gate valves should conform to ISO 10497 standards or API 6FA requirements when it comes to fire test certifications.

If the threaded gate valve does not have any non metallic components, these standards do not have to be met.

A fire test certification guarantees that the threaded gate valve will not fail during an instance of fire occurrence.

ATEX Standards.

These standards represent the regulatory frameworks that dictate the use, installation, and manufacturing of explosive environment apparatus.

They indicate that the threaded gate valve should not have any ignition sources.

The end connections of the threaded valve meet ASME or ANSI  BPE- 1997/2000 requirements.

Besides, the threaded gate valve meets API 598 pressure testing requirements.

Threaded gate valves conform to ISO 90001:2008 quality assurance requirements.

The materials used to manufacture threaded gate valves are EN 10204-3.1 MTR classified materials.

What Types Of Threaded Gate Valves Are There?

Threaded gate valves are classifiable according to the kind of thread ends they have. The different types are; NPT, BSPT, and BSPP.

BSPP

These types of threaded gate valves do not form seals that are as tight as the other types.

An additional component is required to provide fluid-tight sealing, i.e., Soft seal.

The soft seal is compressed in the middle of each component’s flat surface.

Besides, the designations, tolerances, and dimensions of these threads are subject to ISO 228-2:1987 and ISO 228-1:2000 standards.

We specify them using the upper case letter G. For example, G 3”. The letter G means gas.

Hence these threads are best suited for gas applications.

BSSP

BSSP

BSPT

The connection portions of the threaded gate valve that are threaded are also tapered.

Also, the thread flank angles are a little smaller compared to that of NPT threads. The angle from the crest to the root of the thread is often 55°.

You can fit a female BSPT and a male NPT together, albeit with very little fluid-tight sealing because of the threaded angle difference.

The standards to be met in this type are EN 10226-1, ISO 7, or BS21.

We specify these types of threaded gate valves with the letter R. For example, R 3”.

BSPT

BSPT

NPT

The third and final type of threaded gate valve is the NPT. Meaning National Pipe Thread tapered. These types are quarantined to provide your process with a fluid tight sealing without the need for additional parts like soft seals.

They are available in a variety of sizes ranging from 1/6 to 24 inches.

They conform to B1.20.1 ASME/ANSI standards.

We specify them by adding NPT after the size, for example, 1/6″ NPT.

NPT

NPT

What Media/Fluid Can You Control With Threaded Gate Valve?

Threaded gate valves can be used for liquid and gas services.

They are specially designed for slurries with entrained solids, granules, and powders.

You can also use them for cryogenic and vacuum services.

Do Threaded Gate Valves Come With Warranty?

Yes, threaded gate valves come with a limited warranty.

The warranty applies to products manufactured by our company to assure you, the buyer, of our confidence in product quality.

Besides, the warranty posits that a v port ball valve purchased from us or our authorized reseller is free from any defects whatsoever.

This assures peak quality and top form materials that will not fail when used in the recommended conditions.

Your purchase may carry additional warranties for parts of assembly not purchased from us.

How Do You Classify And Select Threaded Gate Valve?

You can use the threaded gate valves in a variety of applications to control an even wider variety of fluid and media.

One of the most critical decisions you have to make is choosing one well-suited to your application or designated function.

To prevent system delays or premature wear and tear, you must consider a few parameters. These are:-

  • The periods you intend to expose the threaded gate valve to media or fluid.
  • The compatibility of the threaded gate valve construction materials to the media you intend to control.
  • The cost and availability of the specific threaded gate valve types.

The cost of the threaded gate valve is also an important consideration to make.

You must select one that is within your budget and still deliver top-notch performance. You should also take additional costs like installation costs into account when choosing a threaded gate valve.

In that regard, it is good to check our catalog to find a threaded gate valve within your budget.

Generally, you require threaded gate valves in specific applications where firm closure is essential.

To buy high quality valves, you must check out the factors mentioned above to get them the best possible product for a long time and robust usage.

  • How effective is the coating of the threaded gate valves?
  • The service pressure and operating temperatures of the threaded gate valve’s intended application.
  • The Properties of the fluid you will be controlling, I.e., are they slurries, do they have debris and other suspended particles?

Another critical factor to consider is the size of your system before selecting a threaded gate valve.

At Kinvalve, we have a range of gate valves depending on your unique requirements.

Whether you need carbon steel gate valve, OS & Y gate valve, wedge gate valve, flanged gate valve or stainless steel gate valve; you will find them right here.

Contact us now for all your threaded gate valve needs.

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