Lift check valve

Lift check valve refers to a valve that automatically opens and closes the valve disc based on the flow of the medium itself, used to prevent medium backflow. It is also known as a check valve, one-way valve, backflow valve, and backpressure valve. Check valve is an automatic valve that mainly functions to prevent medium backflow, prevent pump and drive motor reversal, and prevent the discharge of container medium. Check valves can also be used on pipelines that provide supply to auxiliary systems whose pressure may rise above the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).

Item NO.:
XUVAL33-353
Lead Time:
45 Days
Product Orgin:
CHINA
Brand:
XUVAL
Shipping Port:
Shanghai
Payment:
100%TT
Color:
silvery

Products Details

Technical Parameter：

Test pressure	Nominal Pressure（ MPa ）
Test pressure	1.6	2.5	4	6.4	10
Shell Test	2.4	3.8	6	9.6	15
Sealing test	1.8	2.8	4.4	7.1	11
Material	WCB(C)	CF8(P)	CF 8M (R)	WC6	WC9
Operation temperature	≤ 425	≤ 100	≤ 100	≤ 550	≤ 550
Applicable Medium	Water, steam, oil products	Nitric Acid	Acetic acid	Water, steam	Water, steam

External dimensions：

Nominal Diameter	PN1.6/2.5/4.0MPa		PN6.4MPa		PN10.0MPa
Nominal Diameter	L	H	L	H	L	H
DN32	180	100	260	160	260	165
DN40	200	110	260	165	260	170
DN50	230	115	300	170	300	175
DN65	290	140	340	185	340	190
DN80	310	170	380	205	380	235
DN100	350	200	430	230	430	265
DN125	400	230	500	265	500	310
DN150	480	255	550	310	550	350
DN200	600	285	650	350	650	400

The structure of a lift check valve is generally similar to that of a globe valve. The valve disc moves up and down along the centerline of the channel, with reliable action, but with high fluid resistance, making it suitable for smaller diameter applications. Lift check valves can be divided into two types: straight through and vertical. Direct lift check valves can generally only be installed in horizontal pipelines, while vertical lift check valves should generally be installed in vertical pipelines.

The disc rotation axis of a swing check valve rotates. Its fluid resistance is generally smaller than that of lift check valves, making it suitable for larger diameter applications. Swing check valves can be divided into three types based on the number of valve discs: single disc swing, double disc swing, and multi disc swing. Single disc swing check valves are generally suitable for medium caliber applications. When using a single disc swing check valve for large-diameter pipelines, a slow closing check valve that can reduce water hammer pressure is used to reduce water hammer pressure. Double disc swing check valves are suitable for large and medium diameter pipelines. The double disc swing check valve has a small structure and light weight; Multi disc rotary check valves are suitable for large-diameter pipelines. The structure of a butterfly check valve is similar to that of a butterfly valve. Its structure is simple, the flow resistance is small, and the water hammer pressure is also small.
Installation method

Lift check valve: a check valve with a disc sliding along the vertical centerline of the valve body. Internal threaded check valves can only be installed on horizontal pipelines, and the disc can be used as a ball on high-pressure small diameter check valves. The valve body shape of a butterfly check valve is the same as that of a globe valve (which can be used interchangeably with globe valves), so its fluid resistance coefficient is relatively large. Its structure is similar to that of a globe valve, with the same valve body and disc as the globe valve. The upper part of the valve disc and the lower part of the valve cover are processed with guide sleeves. The guide sleeve of the valve disc can freely rise and fall within the guide sleeve of the valve disc. When the medium flows downstream, the valve disc opens by the thrust of the medium. When the medium stops flowing, the valve disc falls vertically on the valve seat, playing a role in preventing the reverse flow of the medium. The direction of the medium inlet and outlet channels of the through butterfly check valve is perpendicular to the direction of the valve seat channel; The vertical lifting check valve has a medium inlet and outlet channel direction that is the same as the valve seat channel direction, and its flow resistance is smaller than that of the straight through type.

Hot tags :

Nonreturn valve Reflux valve Back pressure valve Internal thread check valve Butterfly Check Valve

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