Pressure Control

Pressure is one of the most essential quantities widely used in various industries; that's why controlling and measuring pressure is very important. In the following content, we provide dedicated information about how to choose and the price of different pressure control equipment, pressure switches, balancers, regulators, pressure transmitters, pressure manometers, etc.

Pressure Control Equipment Experts' Buying Guide and Price List

If you want to use pressure control equipment to measure pressure and vacuum and you don't know exactly what type of pressure control equipment is better to use, with what type of connection, brand, price, and specifications. The following guidelines will help you get through everything.

Pressure can be obtained by dividing the unit of force by the unit of area, which is one of the industry's most critical quantities widely used and measured.

A few pieces of equipment are used to measure pressure, which are called pressure gauges, vacuum gauges, or manometers. Since pressure is not absolute, its value is always determined relative to a reference pressure for measurement. Sometimes the pressure is measured relative to the vacuum pressure.

We have tried to briefly introduce you to various types of pressure control and measurement tools and their functions.

Different Methods of Pressure Measurement 

In terms of measurement pressure is divided into three types:

1. Absolute Pressure: Absolute pressure is the pressure measured relative to a perfect vacuum, with a perfect vacuum being considered the measurement reference or a zero base.
   
   
2. Measuring Pressure: It is measured based on atmospheric pressure and considered a measurement reference or a zero base.
   
   
3. Differential Pressure: Differential pressure is the difference between two distinct points of a system.
   
   

In many pressure measuring devices, instead of the pressure measurement reference (zero base) being considered the current value of the atmospheric pressure, the atmospheric pressure is assumed to be a constant value (for example, 101.325 Kpa). For this reason, such devices may not work correctly at high altitudes.

Different Types of Pressure Control Equipment

 In the following, we will review several standard pressure control equipment:

1. Manometers

A manometer is a device for measuring pressure. A typical manometer consists of a U-shaped glass tube filled with some liquid, usually mercury (due to its high density). They come in both mechanical and digital types.

If mercury is used in the manometer, it is called a mercury manometer; if water is used, it is called a water manometer.

2. Analog Pressure Gauge

An Analog pressure gauge is one of the oldest accurate instruments used in industries to show the amount of pressure. It is still one of the most used equipment for measuring pressure due to its reasonable price.

This equipment is mechanical and consists of a Bourdon tube or diaphragm and in some cases, an element. It can easily measure pressure values ​​over a wide range, even up to 1000 bar by changing the state of the element caused by the pressure and then transmitting this change of state to a calibrated pointer.

Factors to Keep in Mind When Buying an Analog Pressure Gauge

Consider the following factors before buying an analog pressure gauge:

• The desired range of the pressure gauge
• The diameter of the pressure gauge screen
• Type, location, and size of pressure gauge connection
• Pressure gauge accuracy
• Material of pressure gauge (usually steel or brass)
• Horizontal or vertical pressure gauge installation
  
  

3. Digital Pressure Gauge

Digital pressure gauges look relatively similar to analog pressure gauges because they allow you to measure pressure with high capability but digital pressure gauges are much more accurate.

The operator can easily change the pressure ranges or calibrate the device by pressing the keys on the device. More advanced models consider the possibility of saving information as well.

In cases where high accuracy is required, digital pressure gauges are an excellent alternative to analog pressure gauges. Among their disadvantages, it can be pointed out that analog gauges are more tangible for the operator, and it is easier to compare values visually.

In some models of digital pressure gauges, in addition to displaying the pressure value, you can use the device as a pressure switch and pressure transmitter.

Factors to Keep in Mind When Buying a Digital Pressure Gauge

Consider the following factors before buying a digital pressure gauge:

• The pressure measurement range of the device
• Measuring the accuracy of the device
• Size and connection method
• Ability to record values
• Ability to convert units
  
  

4. Pressure Switch

Pressure switches AKA pressure controllers are widely used in the industry to adjust the pressure of tanks or prevent pressure increase in pressurized environments.

Pressure switches are mechanically activated like pressure gauges with Bourdon or diaphragm and element mechanisms at the set point or a relay and act as an On and Off controller with their contact command at the output.

In digital and electronic samples, a strain gauge is used instead of a diaphragm, and a PNP or NPN transistor is usually used in the output. Pressure switches in more advanced models have an output of 4 to 20 mA and an indicator.

Factors to Keep in Mind When Buying a Pressure Switch

Consider the following factors before buying a pressure switch:

• Working range and setting point
• The maximum tolerable pressure of the pressure controller
• It can be used in explosive environments and IP pressure switch
• How to connect and connect the pressure controller
• Accuracy and repeatability of the pressure controller
  
  

5. Pressure Transmitter

The pressure transmitter is one of the most widely used equipment and tools in controlling and monitoring various industrial processes.

In addition to being used in pressure control and value display, pressure transmitters can also be used as liquid-level transmitters, and in differential models, you can even monitor the flow of liquid.

Pressure transmitters are available in inexpensive pen models as well as smart models with HART protocol.

Factors to Keep in Mind When Buying a Pressure Transmitter

Consider the following factors before buying a pressure transmitter:

• Positive or negative pressure
• Accuracy of equipment
• Relative or absolute pressure
• Range or range of measurement
• Required output type
• Corrosive type of material
  
  

6. Differential Pressure Transmitter

Differential Pressure transmitters are one of the most critical instruments. This equipment is widely used in measuring other parameters, such as the height and flow in the tanks.

Factors to Keep in Mind When Buying a Differential Pressure Transmitter

Consider the following factors before buying a differential pressure transmitter:

• Accuracy of the transmitter
• Pressure measurement range
• Equipment bearing pressure
• The material of the capsule is usually steel
• The smartness of the device, which is usually Hart protocol
• Ability to calibrate it
  
  

7. Gas Regulators 

The pressure adjustment mechanism in the regulator is based on the laws of physics and is done mechanically by equipment such as valves and springs.

This pressure reduction is such that by turning the regulator handle, the spring inside the regulator is compressed, and the spring pressure causes the gas to enter the regulator from the inlet. Then, the gas pressure is reduced using the diaphragm.

To choose a gas regulator, in addition to considering the pressure of the main line of gas input and the pressure of the required output gas, you must determine things such as the size of the pipe diameter, the type of rib or flange connection, the flow rate of the required gas and even the brand of the desired regulator.

8. Gas Balancers

Gas balancers adjust the differential pressure by less than 2 psi and make the gas entering the required device uniform. 

Balancers help the efficiency and correct use of the device by accurately adjusting the pressure of the gas passing through the device.

Connection size, inlet and outlet pressure, and gas flow rate are required to select gas balancers correctly.

Buying Pressure Control Equipment

Here at DamaTajhiz HVAC, technical information and prices for all types of pressure control equipment from reputable brands such as Pickens, Danfoss, Vika, etc., have been presented for you to enjoy a good and smart shopping experience.

All products in the DamaTajhiz HVAC store come with the original warranty and the discounts desired by customers have already been included. If you have questions about pressure control equipment, you can contact us through email or WhatsApp.

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