Correct selection and precautions for Pressure Relief Valve

The Pressure Relief Valve is a water pressure control valve. It consists of a main valve and its attached conduit, pilot valve, needle valve, ball valve and pressure gauge. When using a Pressure Relief Valve, you must first pay attention to its selection. Improper selection may cause water blockage and air leakage. When selecting a Pressure Relief Valve, the drainage volume of the Pressure Relief Valve must be selected based on the hourly steam consumption of the equipment multiplied by 2-3 times the selection factor, which is the maximum condensate volume. Only in this way can we ensure that the Pressure Relief Valve can discharge condensation water as soon as possible when driving and quickly increase the temperature of the heating equipment. If the Pressure Relief Valve discharges insufficient energy, the condensate cannot be discharged in time, reducing the thermal efficiency of the heating equipment. When selecting a Pressure Relief Valve, you cannot select a Pressure Relief Valve based on the nominal pressure, because the nominal pressure can only indicate the pressure level of the Pressure Relief Valve body shell, and the nominal pressure of the Pressure Relief Valve is very different from the working pressure. Therefore, the drainage volume of the Pressure Relief Valve should be selected based on the working pressure difference. The working pressure difference refers to the difference between the working pressure in front of the Pressure Relief Valve and the back pressure at the outlet of the Pressure Relief Valve. The selection of a Pressure Relief Valve requires accurate steam blocking and drainage, high sensitivity, the ability to improve steam utilization, no steam leakage, reliable working performance, high back pressure rate, long service life, and easy maintenance are the preferred conditions.

26 April-2024

Basic structure and form of Pressure Relief Valve

There are roughly two types of Pressure Relief Valve: one is a switch-shaped valve that isolates the atmosphere and vacuum space after closing, and the other is a Universal Valve that adjusts the ventilation volume. The latter is used in equipment such as gas introduction. Generally speaking, a Pressure Relief Valve refers to a gas line valve. The basic function of a valve is to truly isolate the atmosphere and vacuum space when closed. (1) Basic structure of Pressure Relief Valve. (1) Valve sealing part. (2) Drive shaft. (3) Cover sealing part. According to the different structures of the three parts, they are used in different vacuum fields. (2) Valve form There are generally four forms of valves, namely angle valves, butterfly valves, straight-way valves and gate valves. Various valves selected according to the vacuum field of application (3) Valve drive There are two types of valve drives: manual and automatic. Automatic valves are mainly driven by compressed air, and some small valves are driven by electromagnets. 2. Universal Valve The Universal Valve is mainly used to control the amount of gas introduced into the vacuum container and to control the effective exhaust speed. (1)Gas introduction valve The valve controls the gas flow rate by controlling the gas conductivity of the contact surface between oxygen-free copper and cemented carbide, with high reliability. The Universal Valve is made of metal and can be used to bake or cut off gas introduction. (2)Flow Universal Valve This kind of valve is installed between the vacuum chamber and the exhaust pump, and adjusts the exhaust speed by adjusting the gas conduction rate. Photo 1 is a butterfly valve that adjusts the gas conductivity through changes in piston angle.

25 April-2024

Structural features of Pressure Relief Valve

1. Leave a position for the valve handle to rotate. 2. Cannot be used as throttling. 3. Universal Valve with transmission mechanisms should be installed upright. The working principle of the Pressure Relief Valve is to unblock or block the valve by rotating the valve. The Universal Valve has a light switch, small size, can be made into a large diameter, reliable sealing, simple structure, and easy maintenance. The sealing surface and spherical surface are always in a closed state and are not easily eroded by the medium. It is widely used in various industries. Pressure Relief Valve are mainly used in pipelines to cut off, distribute and change the flow direction of media. Universal Valve is a new type of valve that has been widely used in recent years. Pressure Relief Valve is a relatively new type of Universal Valve. It has some unique advantages due to its own structure, such as no friction in the switch, the seal is not easy to wear, and the opening and closing torque is small. This allows the size of the actuator to be used reduced. Equipped with a multi-turn electric actuator, the medium can be adjusted and tightly cut off. 4. Pressure Relief Valve can be divided into L-shaped and T-shaped. L-shaped (Q44F) Pressure Relief Valve are used to switch the flow direction of the medium and can connect two channels that are perpendicular to each other; T-shaped (Q45F) Pressure Relief Valve are used for medium Diversion, confluence and flow direction switching. A T-shaped tee can connect three channels to each other or two of them. Pressure Relief Valve generally adopt a two-valve-seat structure, and can also adopt a four-valve-seat structure according to user requirements.

24 April-2024

Applicable occasions and application conditions of Pressure Relief Valve

Since the movement of the valve plate of the Pressure Relief Valve is wiping, most Pressure Relief Valve can be used for media with suspended solid particles. Depending on the strength of the seal, they can also be used for powdery and granular media. The Pressure Relief Valve has a small structural length and overall height, fast opening and closing speed, small fluid resistance when fully opened, and sensitive flow control when opened to approximately 15° to 70°. , the structural principle of the Pressure Relief Valve is suitable for making large-diameter valves. ① Requires throttling, adjustment and control of flow; ②Mud media and media containing solid particles; ③Occasions where the valve structure is required to be short in length; ④Occasions requiring fast opening and closing speed; ⑤ When the pressure difference is small. Pressure Relief Valve can be used when there are double-position adjustments, constricted channels, low noise, cavitation and vaporization, a small amount of leakage into the atmosphere, and abrasive media. When throttling is adjusted under special working conditions or strict sealing is required, or when the Pressure Relief Valve is used under working conditions such as severe wear and low temperature (cryogenic), a specially designed triple-eccentric or double-eccentric valve with a metal sealing belt adjustment device must be used. Universal Valve. The Universal Valve is suitable for bidirectional opening, closing and adjustment of ventilation and dust removal pipelines, gas pipelines and waterways in metallurgy, light industry, electric power, petrochemical systems, etc. Metal-on-metal Universal Valve is suitable for heating, steam supply, water supply, gas, oil, acid and alkali pipelines, etc., as a regulating and intercepting device. In addition to being used as large-scale pressure swing adsorption gas separation control valves, metal-to-Universal Valve can also be widely used in petroleum, chemical industry, metallurgy, electric power, food, medicine, water supply and drainage, gas transportation and other fields.

23 April-2024

How Pressure Relief Valve work and are stored

The Pressure Relief Valve is composed of an electric actuator and a Universal Valve, so it has the advantages of the Universal Valve being easy to operate and simple in structure. It is also widely used in chemical, pharmaceutical and other industries. And with the assistance of electric actuators, the development of Universal Valve has reached a new level. The working principle of the Pressure Relief Valve: the electric device drives the valve stem to cause the butterfly plate to rotate 90° to open and close the valve. The principle of an electric actuator is actually very simple. Just like a razor used daily, the energy source is electricity. The electricity drives the operation of the valve plate, thereby opening and closing the valve and flowing or blocking the fluid. The electric actuator of the Pressure Relief Valve can be divided into switching type and regulating type. The switching type Pressure Relief Valve functions as a switch; while the regulating type Pressure Relief Valve functions to regulate the flow, and can accurately adjust the flow to thousands. Indexing is also a relatively expensive valve. As a device installed in a pipeline, it seems not very practical to check its switching status on the spot, so there is a feedback signal. The adjustable type itself has a feedback signal, while the switch type can choose whether to install a feedback signal according to the customer's specific needs. 1. The product should be stored in a dry and ventilated room and should not be stored in the open air; the sealing ring should not be in contact with oily substances to avoid aging. 2. Storage and transportation: ① Use stuffy covers at both ends of the diameter to prevent dust and rust and keep the passage clean. ② The machined surfaces at both ends of the Pressure Relief Valve should be cleaned of dirt and coated with rust inhibitor. 3. Pressure Relief Valve that have been stored for more than 18 months should be retested before installation and use to ensure the integrity of the structure and function. 4. When placing the Pressure Relief Valve, ensure that the electric device is not squeezed and the wiring terminals are not damaged, and prevent contact with corrosive substances. Handle with care when handling to avoid damaging electrical components and mechanical parts.

22 April-2024