CHECK VALVES

MSTNLAND is a professional vertical check valve upward flowmanufacturer in China. We can provides high performance check valves for different customers, including ball check valve, swing check valve, lifting check valve, titling check valve, external check valve, wafer check valve etc.

The disc of valve open or close by medium flow is called check valve which is a kind of automatic valve for one-way flow of the pipeline, that is only allowed medium flows in one direction of the pipeline system. The check valve is used to prevent the backflow of medium, the pump and drive motor reversal and the discharge of the container medium. Check valves should be installed in the pump outlet or front of the control valve for maintaining convenience.

Different Types Of Check Valve For Sale

Cast Steel Check Valves

Cast Iron Check Valves

Stainless Steel Check Valves

Brass Check Valves

Lift Check Valves

As one oflift check valve suppliersin China, Mstnland provides kinds of lift type check valves for customers to choose from. Following is the lift check valve catalogue.

Swing Check Valves

A swing check valve is a simple device designed for the one-way flow of a liquid or gas. It has a disc that swings on a hinge, opening to allow fluid to flow in, then closing to prevent backflow. Swing check valves are designed in a variety of sizes with different features to suit specific application types. There are also some slight variations on the swing design that better suit particular situations. Swing check valves are among the most common types of check valves and are frequently used to manage a high horizontal flow. The fluid’s pressure opens the disc to allow the water or gas through. After the flow stops, the disc swings back into its closed position, resting against the valve’s seat and preventing backflow. The pressure of any backflow also serves to close the disc.

Forged Steel Check Valves

Check Valves Types and Classification

The valve that opens or closes by the force of the medium flow to prevent the medium from flowing back is called a check valve. Check valves belong to the category of automatic valves, which are mainly used in pipelines where the medium flows in one direction, and only allow the medium to flow in one direction to prevent accidents.

According to the structure, it can be divided into lift check valve, swing check valve and butterfly check valve.

According to the material, it can be divided into cast iron check valve, brass check valve, stainless steel check valve, forged steel check valve, cast steel check valve.

Check Valve Working Principle

The check valves functionis to allow the medium to flow in one direction and prevent the flow in the opposite direction. Usually, this kind of valve works automatically. Under the effect of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve flap act on the valve seat, thereby cutting off the flow. It includes a swing check valve and lift check valve. The swing check valve has a hinge mechanism and a valve disc like a door that rests freely on the inclined valve seat surface. In order to ensure that the valve clack can reach the proper position of the valve seat surface every time, the valve clack is designed in a hinge mechanism so that the valve clack has enough space for rotation and makes the valve clack truly and comprehensively contact the valve seat. The valve clack can be made of metal, or it can be inlaid with leather, rubber, or synthetic covering, depending on the performance requirements. When the swing check valve is fully opened, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve disc of the lift check valve is located on the sealing surface of the valve seat on the valve body. According to the conditions of use, the valve disc can be an all-metal structure, or it can be in the form of a rubber pad or a rubber ring inlaid on the valve disc frame. Like a globe valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and there is little restriction in the flow rate of the swing check valve.

Swing check valve

The disc of the swing check valve is disc-shaped, and it rotates around the shaft of the valve seat passage. Because the inner passage of the valve is streamlined, the flow resistance is smaller than that of the lift check valve. It is suitable for low flow velocity and large diameter occasions where the flow does not change frequently, but it is not suitable for pulsating flow, and its sealing performance is not as good as the lifting type. Swing check valves are divided into three types: single valve, double valve and multi-valve. These three types are mainly classified according to the valve diameter. The purpose is to prevent the medium from stopping or flowing backward and weaken the hydraulic shock.

Lift check valve

It is a check valve whose disc slides along the vertical centerline of the valve body. The lift check valve can only be installed on a horizontal pipeline. The disc can use a round ball on the high-pressure small diameter check valve. . The valve body shape of the lift check valve is the same as that of the globe valve (which can be used in common with the globe valve), so its fluid resistance coefficient is relatively large. Its structure is similar to the globe valve, and the valve body and disc are the same as the globe valve. The upper part of the valve disc and the lower part of the valve cover is processed with guide sleeves. The disc guide can be lifted and lowered freely in the valve guide. When the medium flows downstream, the disc opens by the thrust of the medium. When the medium stops flowing, the valve flap falls on the valve seat by self-sagging to prevent the medium from flowing backward. The direction of the medium inlet and outlet channel of the straight-through lift check valve is perpendicular to the direction of the valve seat channel; the vertical lift check valve has the same direction of the medium inlet and outlet channels as the valve seat channel, and its flow resistance is smaller than that of the straight-through check valve.

Check Valve Installation

Installation Precautions：

Do not allow the check valve to bear weight in the piping system. Large check valves should be independently supported so that they are not affected by the pressure generated by the piping system.

When installing, ensure that the direction of the medium flow should be consistent with the direction of the arrow marked on the valve body.

The lift-type vertical flap check valve should be installed on the vertical pipeline.

The lift-type horizontal flap check valve should be installed on the horizontal pipeline.

Другие товары поставщика

	GLOBE VALVES	MstnLand is a reliable globe valves supplier. We provide high-quality industrial globe valve products, including APIvalve, DIN globe valve, ANSI be...
	CAST IRON GATE VALVES	CAST IRON GATE VALVES MstnLand, as one ofprofessional cast iron gate valves suppliers, provides high performance gate valve products, mainly inc...
	REGULATING VALVES	REGULATING VALVES Pressure self regulating valveare classified on the basis of their nominal capacity as medium-flow, small-flow, and microflow va...
	BUTTERFLY VALVES	Butterfly Valves for Sale MstnLand provides high performance butterfly valve products, including Hard seal and soft seal butterfly valve, triple o...
	HIGH TEMPERATURE AND HIGH PRESSURE NEEDLE VALVE	MstnLand's series of High temperature and high pressure needle Valve is mainly used in high temperature environment of fluid pressure regulation, p...

Все товары поставщика

Похожие товары

	"High-reliability Support ring Y10-4 for power station	Продавец: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD	"High-reliability Support ring Y10-4 for power station Deyang YOYIK have power plant professional...
	"Wear Resistance dn50 globe valve WJ25-F1.6P for thermal power plant	Продавец: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD	"Wear Resistance dn50 globe valve WJ25-F1.6P for thermal power plant YOYIK professional productio...
	High-efficiency Superheater outlet plug valve SD61H-P61305V SA-182 F92 for power generation	Продавец: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD	"High-efficiency Superheater outlet plug valve SD61H-P61305V SA-182 F92 for power generation Deya...
	Automated Sealing gasket for corrugated pipe shut-off valve KHWJ25F3.2P for power station	Продавец: DONGFANG YOYIK (DEYANG) ENGNIEERING CO; LTD	"Automated Sealing gasket for corrugated pipe shut-off valve KHWJ25F3.2P for power station Is a m...
	Class 1500 LB gate valve	Продавец: China LiCB AC DC EV Charger Co., Ltd	Product Name: Low-EmissionPacking Setfor Class 1500 LB API 6D Gate ValveModel: M600Size: ID 68 mm...