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Technical corner

Traps and Orifices Part 2

21/09/2023

The discussion on orifices in Traps and Orifices Part 1 focused on why the diameter of a trap orifice (valve seat) is much smaller than the diameter of the connected piping. In Part 2, we will discuss the significance of the trap orifice number.

Trap Back Pressure

21/09/2023

What is Back Pressure? The 'back pressure' is the pressure just downstream of the steam trap. In other words, back pressure is the outlet or secondary pressure of the trap. The difference between a trap's inlet (primary) pressure and back pressure is called the 'differential pressure'.

Standard boiler water supply safety

15/11/2022

Industrial zones, especially food processing industry, the use of boiler water plays an important role in processing and production. Therefore, the boiler water supply standard also needs to achieve a number of important parameters to ensure safety and hygiene, ensuring the safety of the boiler when operating.

What is a knife gate valve?

09/03/2023

What is a knife gate valve? Knife gate valve has special design for low leakage in corrosive conditions, standard Jis, BS, ANSI, DIN cast iron material, stainless steel, steel made in Taiwan, Korea, China good quality, cheap price, 12-18 months warranty.

Metal Seated Check Valve Leakage Comparison Check Valve API 598-ISO 5208 - FCI 70-2 - MSS SP-61-AS-EN

16/02/2023

Table of Metal Seated Check Valve Leakage Comparison Check Valve API 598 / ISO 5208 / FCI 70-2 / MSS SP-61/AS/EN

The Standards of "Leak testing of Valves"

16/02/2023

Leak testing of Valves ¶ American Petroleum Institute API¶ The API standard 598.. Valve Inspection and Testing, covers the testing and inspection requirements for gate, globe, check, ball, plug and butterfly valves. It has acceptable leakage rates for liquid as well as gas testing. All valves built to the various API standards are required to meet API-598 leakage criteria prior to shipment from the manufacturer or supplier. API 598 states for shell and BACK SEAT tests, no visible leakage is permitted. If the fluid is a liquid, there shall be no visible evidence of drops or wetting of the external surfaces (no visible leakage through the body, body liner, if any, and body-to-bonnet joint and no structural damage). If the test fluid is air or gas, no leakage shall be revealed by the established detection method. For both the low-pressure closure test and the high-pressure closure test, visual evidence of leakage through the disk, behind the seat rings, or past the shaft seals (of valves that have this feature) is not permitted (Plastic deformation of resilient seats and seals is not considered structural damage). The allowable rate for leakage of test fluid past the seats, for the duration of the tests, is listed in the following table..

What is a safety valve?

24/06/2022

Safety valve, English name is Pressure Safety Valve (referred to as PSV), is a type of valve with the function to protect the safety of the system, namely to ensure that the pressure when passing the valve does not exceed the value for permission (pre-installed). During the working process, the safety valve is always closed. When the inlet pressure of the valve exceeds the rated value, the safety valve opens to allow a part of the liquid to flow through the valve and recirculate to the container, ensuring that the pressure through the valve does not exceed the set value. ensure the system is safe, no damage due to overvoltage condition.

Structure of globe valve bellow seal?

20/05/2022

Structure of globe valve bellow seal? What are the advantages of this bellow seal globe valve compared to other common globe valves?

What is pressure relief valve? Classification, structure & working principle of pressure reducing valve

24/06/2022

Pressure reducing valve, English name is Pressure Reducing Valve (abbreviated as PRV), is a valve line with the function of stabilizing the output pressure at a predetermined level, and the outlet pressure is always less than the inlet pressure. Pressure reducing valve is used for the purpose of adjusting the outlet pressure to the desired level, ensuring suitable for the operating pressure of the system behind the valve. The pressure relief valve is usually fitted with two pressure gauges, one to measure the inlet pressure, the other to measure the outlet pressure, making it easy for users to observe when operating the valve.

What is a gate valve?

24/06/2022

What is a gate valve? Gate valve is a type of valve commonly used for the purpose of opening/closing the fluid flow, not often used to regulate flow. Gate valve works with the valve disc moving up and down through connection with the control arm like a gate. It is also for this reason that it is called a gate valve.

What is a butterfly valve?

24/06/2022

1. What is butterfly valve? Butterfly valve, English name is Butterfly valve, shortened to butterfly valve or butterfly valve, is an industrial valve used to regulate (open / close) the flow in pipelines with many different sizes. Due to its structure, it looks like a butterfly, so it is called butterfly valve for short. The valve opens/closes the fluid thanks to the disc element that can rotate around the shaft at different angles. Normally butterfly valves are controlled by levers, cranks or electrical or pneumatic actuators. Along with gate valve, knife valve, ball valve, butterfly valve is one of the types of quick-closing / quick-opening valves. Butterfly valve has a simple, compact structure, and especially the cost to buy this valve is lower than other industrial valves with the same function. 2. Structure & working principle of butterfly valve

What is a check valve?

24/06/2022

1. What is a check valve? Check valve, also known as anti-backflow valve, English name is Check Valve (also known as One way valve or non-return valve), is a type of valve whose main function is to only allow the fluid to flow in the direction of flow. in a certain direction, do not allow the refrigerant to circulate in the opposite direction to affect the equipment/system. Therefore, when installing, it should be noted that they must be installed in the correct direction (usually there will be a symbol on the valve body).