Doshi Impex (India)
Doshi Impex (India)
Girgaon, Mumbai, Maharashtra
GST No. 27ADWPD9257B1Z9

Valves

A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure.

The simplest, and very ancient, valve is simply a freely hinged flap which drops to obstruct fluid (gas or liquid) flow in one direction, but is pushed open by flow in the opposite direction. This is called a check valve, as it prevents or "checks" the flow in one direction. Modern control valves may regulate pressure or flow downstream and operate on sophisticated automation systems
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Globe Valves
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Globe Valves

Approx. Price: Rs 2,700 / nosGet Latest Price
Product Details:
MaterialStainless Steel
Usage/ApplicationIndustrial
PressureHigh Pressure
Body MaterialStainless Steel
TypeLinear Motion
I Deal InNew Only
Payment Terms100% Advance

A globe valve is a linear motion valve used to stop, start, and regulate the fluid flow. The globe valve disk can be removed entirely from the flow path, or it can completely close the flow path. During the opening and closing of the valve, the disc moves perpendicularly to the seat. This movement creates the annular space between the disk and seat ring that gradually closes as the valve closed. This characteristic provides the globe valve good throttling ability required for regulating the flow. Leakage from the globe valve seat is less as compared to the gate valve, mainly due to right angle contact between the disc and seat ring, which allows tighter seal between seats the disk.

Globe valves can be arranged in such a way that the disk closes against the flow or in the same direction of flow.

When the disk closes in the direction of flow, the kinetic energy of the fluid helps closing but obstructs the opening. This characteristic is preferable when a quick-acting stop is required.

When the disk closes against the direction of flow, the kinetic energy of the fluid obstructs closing but helps to open the valve. This characteristic is preferable when quick-acting start is required.

Global Valves part
The globe valve parts such as Body, Bonnet, Stem, Seat, Disk, etc

Globe Valve Disk Types
Globe valve is available in many different types of disc arrangement. The most used disk designs are listed below.

 

Ball Type
Needle Type
Composite type

Types of Globe Valve
Depending on the type of body there are three types of globe valves;
Z types
Y types
Angle Types
Z types Globe Valve

Advantages
Better shut off as compared to gate valve
Good for frequent operation as no fear of wear of seat and disk
Easy to repair, as seat and disk can be accessed from the valve top
Fast operation compares to gate valve due to shorter stroke length.

 


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Pressure Relief Valve
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Pressure Relief Valve

Approx. Price: Rs 3,500 / nosGet Latest Price
Product Details:
MaterialStainless Steel
Usage/ApplicationIndustrial
PressureHigh Pressure
MediaGas
Material GradeStainless Steel
Corrosion ResistanceYes
I Deal InNew Only
Rust ResistanceYes
Rotary TypeNo

A pressure relief valve is a safety device designed to protect pressurized equipment or system during an overpressure event or in the event of vacuum. An overpressure event is a condition, in which pressure inside the equipment or piping system increased beyond the specified design pressure or maximum allowable working pressure (MAWP). If not relieved this can damage the system, property and personal. Similarly, an unwanted vacuum is also dangerous for the system.

The primary purpose of a pressure Relief Valve is the protect the life and property by venting fluid from an over-pressurized system. Vacuum relief valve ensures that vacuum like situation does not occur in the system by allowing air inside the system.

There are three types of pressure relief devices:

 

Reclosing-type pressure relief devices
Non-reclosing type pressure relief devices
Vacuum relief devices

Advantages Conventional PRV
It Can be used in all kind of Gas and Liquid services
Suitable for high pressure and temperature services
Low cost compares to other types

 

Disadvantages of Conventional PRV
Back pressure can affect the functioning of the valve
Spring is subjected to corrosion if service material is corrosive
Not suitable for hazardous services

 


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Needle Valve
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Needle Valve

Approx. Price: Rs 2,100 / nosGet Latest Price
Product Details:
MaterialStainless Steel
Usage/ApplicationIndustrial
PressureHigh Pressure
Structure TypeNeedle
MediaOil
I Deal InNew Only
Payment Terms100% Advance
Test CertificateAlong with Material only
End Connection TypeNPT

A needle valve is a manual valve that used where continuous throttling of flow is required for regulation. Needle valves are similar to the globe valve in design with the biggest difference is the sharp needle like a disk.
Needle valves are designed to give very accurate control of flow in small diameter piping systems. They get their name from their sharp-pointed conical disc and matching seat.
Fluid flowing through the valve turns 90 degrees and passes through an orifice. Due to needle shape disk, a certain portion of the disk will pass through seat opening before disk comes in contact with the seat, which has matching tapered design as a disk. This arrangement permits a very gradual increase or decrease in the size of the opening.
Needle valve has forged and machined body. This body can be of forged carbon steel or stainless steel depending on the services requirements. A seat can be a soft, metal or composite, same as globe valve. Normally needle valves are used in smaller sizes and are provided with either screwed or socket weld end.
All the aspect of needle valve are same as a global valve except its size and pointed needle like disk. You can refer globe valve for more detail.

 

Needle Valve  Application
All field analog instruments are fitted with a needle valve to control flow entry, where sudden surges of fluid under pressure can damage the instruments.

 

Needle valves can be used in situations where the flow must stop gradually and in an application where precise adjustments of flow are required or where a small flow rate is desired such as sample points in the piping

 

Needle valves can be used as both on/off and throttle valves
Used in all type of industries for controlling and metering applications of fluid such as steam, air, gas, oil, water or other non-viscous liquids.


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Plug Valve
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Plug Valve

Approx. Price: Rs 1,800 / nosGet Latest Price
Product Details:
MaterialStainless Steel
Usage/ApplicationIndustrial
I Deal InNew Only
Payment Terms100% Advance
Test CertificaateNABL Test Certificate Along with Material
PackingAs per Requirement

Plug valve is Quarter-turn rotary motion Valve that uses a tapered or cylindrical plug to stop or start the flow. The disk is in plug shape, which has a passage to pass the flow. In open position, this bored passage is in line with the flow. When the plug is turned 90° from the open position, the solid part of the plug blocks the flow. Plug valve is used in place of gate valve where a quick operation is required. It can be used in high-pressure temperature services. 

Plug Valve Parts
Typical plug valve is consisting of body, bonnet, stem and plug. The seat is an integral part of the body in case of lubricated plug valve. For non-lubricated plug valve, a non-metallic seat is used to improve leak tightness of the valve. 

Plug valve disk: Plugs are either round or taper cylinder. They may have various types of port openings, each with a varying degree of the opening area.

Plugs are available with
Rectangular Port
Round Port and
Diamond Port

 

Rectangular Port is the most common for plug valve. The rectangular port represents at least 70% of the corresponding pipe’s cross-sectional area.
Round port plug has a round opening through the plug. It is available in full bore and reduced bore design. Valves with reduced ports are used only where restriction of flow is not important.
Diamond Port plug has a diamond-shaped port through the plug. All diamond port valves are venturi restricted flow type. This design is for throttling service.

 

Types of Plug Valves
Plug valves are available in either a lubricated or non-lubricated design and with different styles of port openings through the plug.

 

Lubricated Plug Valve
The plug in a lubricated plug valve has a cavity in the middle along its axis. You can see this in the image. Lubricant chamber at the bottom and the sealant injection fitting at the top ensure the supply of lubricant.

 

Small check valve below the injection fitting prevents the sealant from flowing in the reverse direction once the sealant is injected into the cavity.

 

Plug surface gets constantly lubricated by the sealant that moves from the center cavity through radial holes into lubricant grooves on the plug surface. The narrow gap around the plug may allow leakage, and if you reduce the gap further, it will increase the friction and plug may get stuck inside the valve body.

Plug Valve Application

Plug valve used as on-off stop valves and capable of providing bubble-tight shutoff.

It can be used in different types of fluid services such as Air, gaseous, vapor, Hydrocarbon, slurries, mud, and sewage applications.

Plug valve can be used in a vacuum to high-pressure & temperature applications

 

Plug Valve Advantages

Simple design with few parts

Quick to open or close

inline maintenance possible

Offers minimal resistance to flow

Provides reliable leak-tight service

Multiple port design helps reduce the number of valves needed and permits a change in flow direction

 

 

 

Disadvantages of Plug Valve

It requires greater force to operate, due to high friction

Larger valves cannot be operated manually and required an actuator

Pressure drop due to reducing port

 

Cost of Plug valves may be more than ball valves for given size and class


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Butterfly Valve
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Butterfly Valve

Approx. Price: Rs 2,100 / nosGet Latest Price
Product Details:
MaterialStainless Steel
Size/DimensionBoth Flanged Ends, Wafer Type Ends, Lug Type Ends & Butt Welded Types Ends
Usage/ApplicationIndustrial
MediaIndustrial
Valve TypeButterfly Valve
Material GradeStainless Steel
I Deal InNew Only
Payment Term100% Advance
Test CertificateAlong with Material only
PackingAs per Requirement

A Butterfly valve is a quarter-turn rotary motion valve, that is used to stop, regulate, and start the flow. Butterfly valves are a quick open type. A 90° rotation of the handle can completely close or open the valve. Normally, they are used in systems where positive shut-off is not required.

Large Butterfly valves are usually equipped with gearbox type actuator, where the handwheel is connected to the stem via a gearbox. This will reduce the force but at the same time reduce the speed of the operation. This type of valve should be installed in the open position. If the valve is closed during installation, the rubber seat will wedge against the valve disc and make it difficult to open.

 

Butterfly Valve Parts
Typical butterfly valve has a short circular body, a round disk, shaft, and metal or soft seats.

 

Types of Butterfly Valves
Based on the type of ends of the body butterfly valves are available in following types.

 

Both Flanged Ends
Wafer Type Ends
Lug Type Ends
Butt Welded Types Ends

 

Butterfly Valve Advantages
Butterfly Valve is suitable for large valve applications due to Compact, lightweight design that requires considerably less space, as compared to other valves
Due to a quick operation, it needs less time to open or close
The maintenance costs are usually low compared to other valve types
A pressure drop across a butterfly valve is small
Valve with Non-metallic seating can be used in chemical or corrosive media.

 

Butterfly Valve Disadvantages
Throttling is limited to low differential pressure services and that too with a 30- to 80-degree disc opening.

 


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  • Check Valve
  • Check Valve
Check Valve
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Check Valve

Approx. Price: Rs 1,500 / nosGet Latest Price
Product Details:
MaterialStainless Steel
Usage/ApplicationIndustrial
Material GradeStainless Steel
I Deal InNew Only
Payment Terms100% Advance
Test CertificateTest Report along with Material
PackingAs per customer requirement
The valve that used to prevent backflow in a piping system is known as a check valve. It is also known as a non-return valve or NRV. The pressure of the fluid passing through a pipeline opens the valve, while any reversal of flow will close the valve. It allows full unobstructed flow and automatically shuts as pressure decreases. The exact operation will vary depending on the mechanism of the valve

Parts of Non-Return Valve

It is consists of body, cover, disk, hinge pin, and seat ring. In the image below you can see the parts of the valve.

Types of Valves

The type of disk will decide the type of valve. Most common types of Check valves are

Swing Type.
Top Hinged
Tilting disk

 

Lift Type
Piston Type
Ball type

 

Dual Plate Type
Stop Check Valve

Application of Check Valve (NRV)

Check valves (Non-return valve) are used in a piping system to prevent backflow. The discharge line of rotary equipment such as pump and compressor always fitted with a check valve to prevent backflow


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Ball Valve
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Ball Valve

Approx. Price: Rs 1,200 / nosGet Latest Price
Product Details:
MaterialStainless Steel, Mild Steel, Carbon Steel, Duplex, Super Duplex, Titanium, Brass
BrandDoshi Impex (DI)
Usage/ApplicationIndustrial
Temperature Of MediaHigh Temperature, Low Temperature, Medium Temperature
WOG Rating150, 300, 600
Packaging TypeAs per requirement
Is It BrandedBranded
I Deal InNew Only
Payment Terms100% Advance
Test CertificateNABL Report Along with material

A Ball valve is a quarter-turn rotary motion valve that uses a ball-shaped disk to stop or start the flow. It resembles a plug valve in many ways. When a port in the ball is in line, it allows flow whereas when you rotate the valve 90 degrees, solid part of the ball stop the flow. Most ball valves are of the quick-acting type, which requires a 90° turn of the valve handle to operate the valve. But in case large size valve which required considerable force to open or close the valve, the gear-operated actuator is used. With this arrangement, a small handwheel is enough to operate a fairly large valve.
Major components of the valve are the body, spherical ball, steam, and seats. It can be metal seated or soft seated.
This valve may be unidirectional, bidirectional, or multidirectional, depending on the number of valve ports and the number of valve seats. Same as multiport plug valve. 

3 Way Ball Valve
Depending on requirements, We can arrange the port of valve in the three-way.

One inlet and two distribute
One inlet and one outlet with diverting a flow
Straight pass the fluid without No inlet

 

Three patterns are available. Venturi port type, full port type, and reduced port type. The full-port ball valve has an inside diameter equal to the inside diameter of the pipe. This design allows pigging. In the venturi and reduced-port types, the port is generally one pipe size smaller than the line size.

 

The ball type disc can be a free float or fixed in the valve body. A free-floating valve is known as a floating type whereas a fixed type valve is known as a trunnion mounted valve.

 

 

Types of Ball Valves
Ball valves are manufactured in different body arrangements. Based on this valve can be classified in the following ways;

 

Top entry
Side entry or split body
Three-piece body

For Extremely high pressure and temperature services, the full welded body is also used

Applications of the Valve
It can be used in different types of fluid services as an on-off stop valve that provides bubble-tight shutoff.
It can be used in air, gaseous, and vapor services as well as hydrocarbon services.
Metal seated valves can be used in high-pressure & temperature applications.
it is widely used with instrument tubing to connect instruments.

 

Advantages
It is quick to open and close type that provides bubble-tight reliable sealing in high-pressure temperature applications.
It is smaller and lighter than a gate valve of the same size and rating.
Several designs of ball valves offer the flexibility of selection so that you can choose the valve that suits your requirements.
Easy to operate and Cost-effective maintenance.

 

Disadvantages
It cannot be used in service that required throttling.
In slurry or other similar applications, the suspended particles can settle and become trapped in body cavities causing wear, leakage, or valve failure.
Due to rapid opening and closing, surge pressures may arise which could damage downstream equipment.

 


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Gate Valve
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Gate Valve

Approx. Price: Rs 1,500 / NosGet Latest Price
Product Details:
MaterialStainless Steel
BrandDoshi Impex(DI)
Usage/ApplicationIndustrial
MediaAir, Water, Gas
Product TypeValve
Packaging TypeAs Per Requirement
Payment Terms100% Advance
I Deal InNew Only
Test CertificateAlong With Material
End Connection TypeFlanged

A gate valve can be defined as a type of valve that used a gate or wedge type disk and the disk moves perpendicular to flow to start or stop the fluid flow in piping.A gate valve is the most common type of valve that used in any process plant. It is a linear motion valve used to start or stop fluid flow. In service, these valves are either in fully open or fully closed position. When the gate valve is fully open, the disk of a gate valve is completely removed from the flow. Therefore virtually no resistance to flow. 
Gate valves are used in almost all fluid services such as air, fuel gas, feed water, steam, lube oil, hydrocarbon, and all most any services. Gate valve provides good shutoff. 

Types of Gate Valves

Types of Disk
Solid taper wedge
Flexible wedge
Split wedge or Parallel disks Valve

 

Types of Body Bonnet Joint
Screwed Bonnet
Bolted-Bonnet
Welded-Bonnet
Pressure-Seal Bonnet

Types of Stem movement
Rising Stem or OS & Y Type (Outside Stem and Screw Type)
Non-rising Stem type

 

Solid Wedge Gate Valve
Solid wedge is most common & widely used disk types because of its simplicity and strength. A valve with solid wedge may be installed in any position, and it is suitable for almost all fluids. It can be used in turbulent flow also.
However, it does not compensate for changes in seat alignment due to pipe loads or thermal expansion. So, this type of disk design is most susceptible to leakage. Solid wedge is subjected to thermal locking if used in high-temperature service.

Flexible Wedge Gate Valve
The flexible wedge is a one-piece solid disk with a cut around the perimeter. These cuts vary in size, shape, and depth. A shallow, narrow cut on wedge perimeter gives less flexibility but retains strength. A cast-in recess or deeper and wider cut on wedge perimeter gives more flexibility but compromises the strength.

Split wedge or Parallel disks Gate Valve
Split wedge Disk consists of two solid pieces and holds together with the help of special mechanism. You can see the same in images. In case, one-half of the disk is out of alignment; the disk is free to adjust itself to the seating surface. The split disk can be in a wedge shape or a parallel disk type.

Types of gate valve based on body, bonnet connection
1st is screwed bonnet
2nd is bolted-bonnet
3rd is Welded-Bonnet
4th one is Pressure-Seal Bonnet

OS & Y Gate Valve or Rising Stem (Outside Stem and Screw Type)
For a rising stem valve, the stem will go up while opening the valve and move down when you close the valve. You can see in the image. In inside screw design, the threaded portion of the stem is in contact with the flow medium and when you open the valve, handwheel rise with the stem. 

 

Non-Rising Stem Gate Valve – Insider Screw Valve
There is no upward movement of the stem in a non-rising stem type. The valve disk is threaded internally. The disc travels along the stem like a nut when the stem is rotated. You can see the image. In this type of valve, stem threads are exposed to the flow medium.

 

Gate Valve Applications
Gate valves are used in almost all fluid services such as air, fuel gas, feedwater, steam, lube oil, hydrocarbon, and all most any services.
Some special gate valve is used in slurry and powder product also such as knife gate valve

 

Advantages of Gate Valve
Gate valve provides good
Pressure drop during operation is very less.
Most of the gate valve can be used as bi-directional
They are suitable for high pressure and temperature application and required less maintenance


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  • Pinch Valve
  • Pinch Valve
Pinch Valve
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Pinch Valve

Approx. Price: Rs 900 / nosGet Latest Price
Product Details:
MaterialStainless Steel
Usage/ApplicationIndustrial
PressureHigh Pressure
Payment Terms100% advance

The pinch valve is also known as clamp valve. It is a linear motion valve. Used to start, regulate, and stop fluid flow. It uses a rubber tube, also known as a pinch tube and pinch mechanism to control the fluid. This valve is the simplest in any valve design

Pinch tubes are manufactured of natural or synthetic rubbers and sometime plastics which have good abrasion resistance properties. Most pinch valves are open style in which the pinch tube is exposed. However, another style fully encloses the pinch tube within a metallic body. You can see both the design in the image

 

Pinch Valve – Application

It is ideally suited for the handling of slurries, liquids with large amounts of suspended solids, and systems that convey solid material pneumatically.

 

Pinch Valve – Advantages

It can be used for application where corrosion or metal contamination of the fluid might be a problem. Flow from the valve is straight without any obstruction.

There are no internal moving parts in contact with the fluid hence, low maintenance cost.

Inexpensive due to simple construction

Pinch Valve – Disadvantages

It cannot be used in high temperature-pressure applications and gas media

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