Month: September 2019

Heating, Ventilation, and Air Conditioning System (HVAC)


Since all the mechanical systems that provide thermal comfort and air quality in a room/indoor area are interconnected, they are often grouped together and are called HVAC systems. It includes central air conditioners, heat pumps, boilers, furnaces, rooftop units, chillers, and packaged units.

HVAC valves are used to control flow in pipes. Major components of an HVAC system such as water chiller, cooling water pumps, air handling units, and fan coil units use valves to control the flow of water, gas, and air.

What is HVAC System?

HVAC is the acronym for Heating, Ventilation, and Air Conditioning. HVAC refers to the various systems that are used along with heating and cooling buildings (both commercial and residential). An HVAC system is responsible for keeping you fresh and cool in summer and making you feel warm and cosy in winter. Apart from just keeping a place warm or cool, HVAC systems are also responsible for improving indoor air quality while providing comfort to everyone inside the building.

What are the different types of valves used in HVAC System?

Plug valves (seat valves), ball valves, and butterfly valves are the most common types of valves used in heating, ventilation, and air conditioning system. Other valves used in HVAC system include knife gate valves, diaphragm valves, and gate valves.

Heating and cooling Hydronics-triple duty valves acts as a check valve, shut-off valve, and balancing valve all at the same time. Automatic flow limiting valves are used to vary the speed pumping systems that control the flow of the water in HVAC systems while automatic temperature control valves are used to reduce the temperature of the water in the domestic hot water pipe.

A pressure reducing valve is used to reduce the pressure of the water in the HVAC hydronic loop while circuit setter valves are used to maintain a set amount of flow through a piping loop.

HVAC systems not only regulate the temperature of the indoor space but also maintain the indoor air quality. However, it is important to use high-quality industrial valves in order to get the best results.

SKG PNEUMATICS INC is the leading industrial valve suppliers in India. In fact, all their valves go through multiple ruggedness-testing procedures to ensure that their customers receive the best industrial valves.

Applications and Working process of Control Valve


A valve is a device that regulates the fluid flow as well as the pressure within a system or process. Unlike on-off valves, a control valve is used to regulate the fluid flow by stopping and starting the fluid flow as per the direction is given by the controller.

Control Valve

Control valves consist of three main parts: the valve, the actuator, and the controller. Various components of the Actuator include rain cap, eye bolt, diaphragm, spring, actuator stem, diaphragm case, scale plate, stem connector, and yoke.

The components of body part include packing flange, packing follower, yoke claim nut, gland packing, valve stem, bonnet, stud bolt and nut, gasket, guide ring, guide bushing, valve plug, seat ring, valve body, trim set, and positioner.

Though the primary purpose of a control valve is to regulate the fluid flow, there are two main forms of action i.e. the sliding stem and the rotary action. The most common type of control valves in the sliding stem include globe valve, angle body valve, and angle seat piston valve while the rotary action includes a butterfly valve and ball valve.

Why Control Valves are Used?

Control valves are used for various purposes in the industrial, engineering, manufacturing, and scientific communities. The primary purpose of a control valve is to regulate the rate of the fluid flow by varying the size of the flow passage. Control valves are most commonly used for consequential control of process quantities including pressure, temperature, and the liquid level.

How do Control Valves work?

With the help of opening and closing internal passages, control valves regulate the fluid flow. Control valves form a control loop which is then used by a controller to send signals. Control valves respond to these signals and adjust the internal openings accordingly.

Control valves use the actuator to move the valve stem. Usually, it is either air (pneumatically) or electrically driven. The pressure between the inlet and outlet decides the rate of flow through the valve.

In order to reduce the fluid flow, the valve is closed, which results in more back-pressure and increases the difference between the inlet and outlet pressures.

Control valves help in controlling the fluid flow and are used in various industries including pipeline, oil & gas, food & beverage, the biopharma industry, and marine industry.

SKG PNEUMATICS INC is the top industrial valve suppliers and they are also the leading control valve suppliers in India. All their products are tested for resilient durability to provide the best industrial valve to their customers.