Coimbatore Flow Controls

Ram Nagar, Coimbatore, Tamil Nadu

A check valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem.

Special Features:

• Very low face to face dimension hence space required for mounting is less than 10% of conventional valves
• Very low weight total weight is only approximately 1/6 the weight of a conventional valves
• Saving in terms of overall length required for piping
• Practically maintenance free due to fewer number of parts and simple construction
• Self centring in pipeline due to controlled outside diameter, enables easy installation
• Valve can mount any direction

Applications

1. Delivery line of pumps
2. Chemical industry
3. Petrochemical industry
4. Compressed air, gases and vacuum lines
5. Refineries
6. Water and effluent plants
7. Corrosive liquids and gases
8. Filtration and Ion exchange process

Constructional Features

Body

The body is the main pressure containing structure of the valve and the most easily identified as it forms the mass of the valve. It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve.

Disc

The disc provides a leak proof closure for the valve body. The disc can rotate on its axis and thereby prevented the local wear.

Seat

Seat shall be PTFE and conform to relevant standard Replaceable

Technical Specification

Design and Manufacturing Standard

API 6D

Testing Standard

API 598

Size range

50mm to 600mm

Operation

Non slam check valves are opened by the pressure of the fluid and closed by the spring as soon as flow ceases and before reverse flow occurs.

Diaphragm valves (or membrane valves) consists of a valve body with two or more ports, a diaphragm, and a "weir or saddle" or seat upon which the diaphragm closes the valve. The valve is constructed from either plastic or metal.
Originally, the diaphragm valve was developed for use in industrial applications. Later on the design was adapted for use in the bio-pharmaceutical industry by using compliant materials that can withstand sanitizing and sterilizing methods.

Special Features :

• Compact Design
• Maintenance free
• Large area mounted actuator diaphragm
• Moving parts concealed
• Cast iron diaphragm housing

Applications :

• Water treatment plants
• Fertilizer & Petro chemical plants
• Chemical Industries & Refineries
• Process industries & thermal power stations

Advantages :

• Steady flow
• Tight shut off
• No stem packing
• Easy diaphragm replacement
• Effortless operation
• Less wear & tear
• Better life span

A gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is desired. The gate faces can form a wedge shape or they can be parallel. Gate valves are primarily used to permit or prevent the flow of liquids, but typical gate valves shouldn't be used for regulating flow, unless they are specifically designed for that purpose. Because of their ability to cut through liquids, gate valves are often used in the Petroleum industry.

A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipe line, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.

Globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. This has an opening that forms a seat onto which a movable plug can be screwed in to close (or shut) the valve.

Special Features:

• Compact Design
• Maintenance free
• Bolted bonnet, solid wedge gate, outside screw and yoke with rising/non rising stem of gate valve, Plug type disc and outside screw and yoke are provided ease of operation
• Wedge Ground and lapped to precision
• Gland Self aligning type
• Integral satellite seat and backseat

Applications

1. Cement & textile industry
2. Fertilizer & chemical plants
3. Petrochemical Industries & Refineries
4. Steel plants
5. Thermal, hydel and nuclear power plants
6. Pulp & paper Industry
7. Water & sewage treatment plants
8. Food and beverage industries
9. Pharmaceutical industry & Gas pipelines Etc.

Constructional Features

Body

The body is the main pressure containing structure of the valve and the most easily identified as it forms the mass of the valve. It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve. The bonnet is connected to the body and provides the containment of the fluid, gas, or slurry that is being controlled.

Bonnet

The bonnet provides a leak proof closure for the valve body. The threaded section of the stem goes through a hole with matching threads in the bonnet. Globe valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest bonnet, offering a durable, pressure-tight seal.

Wedge

The closure member of the valve, wedge are connected to the stem which is slid or screwed up or down to throttle the flow. Wedge is typically of the balance or unbalanced type. Unbalanced wedge are solid and are used with smaller valves or with low pressure drops across the valve. The advantages are simpler design, with one possible leak path at the seat and usually lower cost. Balanced plugs have holes through the plug. Advantages include easier shut off as the plug does not have to overcome static forces.

Stem

The stem serves as a connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator controlled valves or threaded for manual valves. The smooth stems are surrounded by packing material to prevent leaking material from the valve. This packing is a wearable material and will have to be replaced during maintenance.

Seat Ring

The seat ring provides a stable, uniform and replaceable shut off surface. Seat rings are usually held in place by pressure from the fastening of the bonnet to the top of the body. This pushes the cage down on the lip of the seat ring and holds it firmly to the body of the valve. Seat rings may also be threaded and screwed into a thread cut in the same area of the body

Technical Specification

Design and Manufacturing Standard

API 600 for Class 150#

Testing Standard

API 598 / BS 6755

Size range

15mm to 1000mm (Class 150 & Class 300 )

Operation

Manual hand Wheel

Electrical and Pneumatic actuator with accessories.

A gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restriction is desired. The gate faces can form a wedge shape or they can be parallel. Gate valves are primarily used to permit or prevent the flow of liquids, but typical gate valves shouldn't be used for regulating flow, unless they are specifically designed for that purpose. Because of their ability to cut through liquids, gate valves are often used in the Petroleum industry.

A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipe line, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.

Globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. This has an opening that forms a seat onto which a movable plug can be screwed in to close (or shut) the valve.

Special Features:

• Compact Design
• Maintenance free
• Bolted bonnet, solid wedge gate, outside screw and yoke with rising/non rising stem of gate valve, Plug type disc and outside screw and yoke are provided ease of operation
• Wedge Ground and lapped to precision
• Gland Self aligning type
• Integral satellite seat and backseat

Applications

1. Cement & textile industry
2. Fertilizer & chemical plants
3. Petrochemical Industries & Refineries
4. Steel plants
5. Thermal, hydel and nuclear power plants
6. Pulp & paper Industry
7. Water & sewage treatment plants
8. Food and beverage industries
9. Pharmaceutical industry & Gas pipelines Etc.

Constructional Features

Body

The body is the main pressure containing structure of the valve and the most easily identified as it forms the mass of the valve. It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve. The bonnet is connected to the body and provides the containment of the fluid, gas, or slurry that is being controlled.

Bonnet

The bonnet provides a leak proof closure for the valve body. The threaded section of the stem goes through a hole with matching threads in the bonnet. Globe valves may have a screw-in, union, or bolted bonnet. Screw-in bonnet is the simplest bonnet, offering a durable, pressure-tight seal.

Wedge

The closure member of the valve, wedge are connected to the stem which is slid or screwed up or down to throttle the flow. Wedge is typically of the balance or unbalanced type. Unbalanced wedge are solid and are used with smaller valves or with low pressure drops across the valve. The advantages are simpler design, with one possible leak path at the seat and usually lower cost. Balanced plugs have holes through the plug. Advantages include easier shut off as the plug does not have to overcome static forces.

Stem

The stem serves as a connector from the actuator to the inside of the valve and transmits this actuation force. Stems are either smooth for actuator controlled valves or threaded for manual valves. The smooth stems are surrounded by packing material to prevent leaking material from the valve. This packing is a wearable material and will have to be replaced during maintenance.

Seat Ring

The seat ring provides a stable, uniform and replaceable shut off surface. Seat rings are usually held in place by pressure from the fastening of the bonnet to the top of the body. This pushes the cage down on the lip of the seat ring and holds it firmly to the body of the valve. Seat rings may also be threaded and screwed into a thread cut in the same area of the body

Technical Specification

Design and Manufacturing Standard

API 602 / BS 5352

Testing Standard

API 598 / BS 6755

Size range

15mm to 50mm (Class 800 & Class 150 )

Operation

Manual hand Wheel

Electrical and Pneumatic linear cylinder with accessories