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What is a flanged valve? Checking the types of flange valves

Imen Datis Asia » articles » What is a flanged valve? Checking the types of flange valves

Flanged valve is a type of valve that is made by combining two separate parts, i.e. flange and sliding valve. These two pieces are connected to each other by welding and form the flanged sliding valve.

Imen Datis Asia Technical and Engineering Company, one of the top providers of precision instrument equipment in the country, with the aim of improving the quality of industries in the field of precision instruments, has provided the equipment needed by the oil, gas and petrochemical industries. This store sells all kinds of flanged sliding valves with the best price and quality.

gate valves

A gate valve or sliding valve is a type of valve designed to completely cut off the flow or create a connection between two fluid flows. These valves work only in two positions, fully open or fully closed, and half-open mode is not possible. The function of the gate valve is performed by a vertical gate located in the flow path. This gate is able to move in the direction of the flow and, based on the need, completely cut off or open the flow. In gate valves, the connection between the valve and the pipe is established through flanges.

One-way valve between flanges (disc)

The one-way valve between the stainless steel flange (disc) or the one-way flanged valve is a piece that is installed between two stainless steel flanges and prevents fluid return with its stainless steel disc and back spring. This valve is produced in sizes 1/2 to 8 inches and from 304 and 316 alloys.

The stainless steel disc model, which is also known as a wafer one-way valve, is placed between two stainless steel flanges and prevents the fluid from returning with a stainless steel disc and a spring behind it. This valve is suitable for use with all types of liquid, gas and steam fluids at high temperatures and severe corrosive conditions.

The inter-flange disc automatic flanged valve is available in alloys 304 and 316. In highly corrosive environments and acidic conditions, it is recommended to use 316 alloy. The steel disc one-way valve has a standard gasket and can be used for steel flanges with dimensional standards of class 150, class 300, PN10, PN16 and PN40.

One-way valves are known as automatic valves because they do not require manual control by the operator. These valves are automatically opened and shut off by fluid flow (velocity pressure), and closed by gravity or back pressure to prevent flow from upstream to downstream.

Introducing the flanged sliding valve

Flanged sliding valve is a type of valve that is made from the combination of two separate parts, i.e. flange and sliding valve. These two parts are welded together and form the flanged sliding valve. The main task of these valves is to control and cut off and connect the fluid flow in installations and piping. Due to the special design and dimensions, these valves are especially used in oil and gas industries and in laboratory activities.

One of the prominent features of the flanged slide valve is the high ability of its disc or stem to close and open the fluid flow quickly. Connecting the valve to the pipe is done through a flange and using bolts and nuts. A gasket is used to prevent leakage at the joint.

The upper part of the sliding valve, which is connected to the body with a flange and a bolt, is known as **Metal Cover (Bonnet)**. A gasket is used to ensure tightness and prevent leakage between the body and the cap. In large-sized sliding valves, in addition to the ability to close in full flow condition, it is necessary to balance the pressure on both sides of the valve using a bypass system before the valve opens.

Types of flanges for sliding valves

The flanges used in the flanged sliding valve can be available in different types. In the following, we will introduce the common types of flanges for flanged sliding valves:

Plain surface flange: This type of flange is used to connect valves and cast iron fittings or non-steel flanges of pumps. It is usually used in low pressure lines and in situations where leakage is not important.
Flange with raised surface: In these flanges, the surface that is placed in front of another flange is designed more prominently. These flanges usually have a polished or grooved surface and are suitable for bearing high pressures, subzero temperatures, and fluctuating and vibrating loads.
Welded neck flange: This type of flange has a conical neck that is welded to it. The presence of a neck in this flange strengthens it against pressure. These flanges are suitable for conditions with high pressure, sub-zero temperatures and fluctuating and vibrating loads.
Blind flange: This flange is designed in the form of a round and closed plate and is used at the end of pipes and paths under pressure. Blind flanges are usually able to withstand more pressure than other flanges, and the maximum pressure is in the center.
Surface flange: This type of flange is used in public services and its installation is simple. Facing flanges have good resistance to internal pressure and fatigue load.
Flange flange: This flange is similar to the normal flange, but it is designed without a bottom layer and its end is chamfered. The pipe is welded to its other end. This flange is not in contact with the fluid and its resistance to fatigue is lower than the throat flange.
Chambered welding flange: This flange has a chamber in which the pipe is placed. This type of flange is well designed for special conditions such as high pressure and variable temperatures.

Choosing the right type of flange for the sliding valve depends on the operating conditions, pressure, temperature and type of fluid in the system. In practice, to connect valves and fittings to pipes, it is necessary to choose the appropriate type of flange based on the standards and specific needs of the system.

In order to better understand the use of each type of flange and its effect on the performance of the flanged slide valve, it is necessary to introduce the flange manufacturing standards and explain each one. Then you can continue to check more features of the flanged slide valve.

The concept of flange standards such as DIN and ASME:

Flange standards such as DIN and ASME have significant differences in their concepts and approaches. Some of these important differences are mentioned below:

Measurement system:
- The DIN standard uses the metric system and the dimensions of the flanges are defined in millimeters.
- The ASME standard is based on the inch system and the dimensions of the flanges are specified in inches.
Design and shaping:
- The DIN standard usually specifies flanges with a smooth surface and uniform thickness. The design of DIN flanges is a flat plate with a uniform surface.
- ASME standard includes different types of flanges such as pipe flanges (Weld Neck), edge flanges (Slip-On), loose flanges (Socket Weld) and other types of flanges. These standards are designed for different connections and applications.
Pressure and temperature:
- DIN and ASME standards differ in how flanges are designed and calculated for pressure and temperature conditions. Each standard is designed based on regional needs and requirements and specific specifications.
Numbering and naming:
- The DIN standard identifies flanges with numbers such as PN6, PN10, PN16, etc., which refer to the nominal pressure of the flange.
- The ASME standard names flanges with classes such as Class 150, Class 300, Class 600, etc., which are related to the working pressure of the flange.

These differences lead to a significant impact on the selection and application of flanges in different systems and make the need to understand the different standards in order to optimally use this equipment necessary.

Imen Datis Asia Company, as a company approved by the fire department, in addition to consulting in order to obtain fire department approval, is an importer and supplier of all types of fire department equipment, including fire pumps, fire valves, fire alarm and fire extinguishing equipment from the best and most reliable domestic brands. And it is foreign. In this regard, Ayman Datis Asia Technical and Engineering Company has the official representative of Safex Fire brand fire valves in Iran.

For more information and price inquiries, please contact our experts.

DIN and ASME flange standards:

In the DIN and ASME flange standards, the DN (Nominal Diameter) and Inch represent the nominal pressure or flange class, respectively. In the following, more explanations are provided in this field:

1. DIN standard:

In the DIN standard, the DN number (Nominal Diameter) refers to the nominal diameter of the pipe. For example, DN50 means a nominal diameter of 50 mm.

Nominal pressure is defined in the DIN standard using the PN number (Nominal Pressure). For example, PN10 indicates a nominal pressure of 10 bar.

Therefore, in the DIN standard, each DN number is characterized by a nominal pressure PN. For example, DN50 PN10 means a flange designed for a pipe with a nominal diameter of 50 mm and a nominal pressure of 10 bar.

2. ASME standard:

In the ASME standard, the size of flanges is determined using inches. For example, a 2″ flange means a 2″ diameter.

This standard also specifies the working pressure using flange classes. For example, Class 150 indicates a working pressure of 150 psi.

Consequently, in the ASME standard, each flange size is associated with a flange class. For example, a 2-inch Class 150 flange means a flange designed for a 2-inch diameter and a working pressure of 150 psi.

Thus, in DIN standards, the DN number is related to the nominal pressure PN, while in ASME standards, the flange size is related to the flange class. These definitions and relationships are specific to each standard and may not be applicable to other standards.

Application of DIN and ASME standards in different industries

DIN and ASME standards in various industries
DIN standard:

Oil and gas industry
Chemical industry
Water and sewage industry
Electricity industry
ASME standard:

power plant industry
Petrochemical industry
Automotive industry
aerospace industry
It should be noted that the choice between DIN and ASME standards depends on the specific needs and technical requirements of each industry. To ensure the correct and appropriate use of these standards, consultation with technical experts related to the desired industry is recommended.

Stem structure
The stem is a long and narrow rod that is connected to the hand wheel on one side and to the gate on the other side. The stem passes through a box called “stuffing box”.

Types of Gate Valve:

Parallel Type Gate Valve:
This type consists of a gated flat disc placed between two parallel seats. These valves have a sharp edge at the bottom which is designed to cut and remove solid particles entering the valve. The distinctive feature of these valves is that they can be used for both asymmetric seats and angular seats.
Gate Valve with wedge shape:
In this type of valves, two diagonal seats and a diagonal gate are used to allow the complete closing of the valve. The sliding stem moves up and down to adjust the opening and closing amount of the valve. In the slide valve, the direction of fluid movement is completely straight, and when the valve is fully open, the drawer moves out of the flow path and the pressure drop is minimized. Also, the flow turbulence is significantly reduced.

fire hydrant

Application of flange valve

This product is used in various industries, including petrochemical and refineries, oil and gas transmission lines, oil platforms, and steel and cement plant facilities.

What is a flanged ball valve?

Flanged ball valve, also known as flanged wing valve, is produced according to two standards, DIN and API. The API standard is the most widely used, especially for class 150 to 2500 flanges.

What is a one-way valve between flanges (disc)?

The one-way valve between flanges (disc) made of stainless steel is a piece that is placed between two stainless steel flanges. This valve prevents fluid from returning by using a stainless steel disc and a spring behind it. This model is available in sizes from 1/2″ to 8″ and is made from 304 and 316 alloys.

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