Full size American standard check valve

Full bore American standard check valve is a valve designed and manufactured in accordance with API or ANSI standards. It is widely used in thermal power plants, petrochemical, metallurgical and other high temperature and high pressure water, steam, oil, superheated steam pipelines as a device to prevent medium backflow. The flange connection method usually adopts CLASS150LB-2500LB specifications, which can meet various industrial needs.

I. Product overview
The valve body materials of full-bore American standard check valve mainly include cast steel, stainless steel and chromium molybdenum steel, and the sealing surface adopts surfacing chromium stainless steel, surfacing hard alloy, chromium nickel titanium stainless steel and other materials to ensure that the valve can still maintain excellent sealing performance under high temperature and high pressure environment. In addition, the gasket of the valve is usually made of steel strip graphite or PTFE material, which further enhances the sealing and durability of the valve.

II. Product Features
1, full-bore design: full-bore American standard check valve body diameter and the same pipe diameter, fluid flow through without changing the flow direction or flow rate, reducing the fluid resistance, improve the efficiency of the pipeline system.
2, a variety of connection methods: the valve can be flange, welding, clamping and other connection methods, so that users can choose the appropriate connection method according to actual needs.
3, wide range of application: the valve is suitable for high temperature and high pressure water, steam, oil and other media, can be in bad conditions for a long time stable operation.
4, excellent sealing performance: the use of high-quality sealing materials and unique sealing structure to ensure that the valve can maintain good sealing performance under various conditions.

III. Precautions for use
Before use, please read the product manual carefully to understand the structure, performance and use of the valve.
In order to prevent excessive piping stress due to temperature changes, temperature changes should be minimized and U-shaped expansion joints should be added before and after the valve.
3, prohibit the use of pull rod switch check valve, so as not to damage the sealing surface. Observe the check valve switch indication position and limit device to ensure that the valve can open and close properly.
4, regularly check the sealing performance of the valve, such as found that the sealing surface damage or leakage phenomenon, should immediately repair or replace the seal.
5, such as the handle and handle rotation is not flexible or can not open and close the check valve, you can properly loosen the push nut to adjust. If it is still unable to be opened and closed flexibly after adjustment, it is necessary to carry out decomposition inspection to remove dirt and eliminate faults.

IV. Implementation norms
Design and manufacturing standard: API 6D
Structural length standard: ASME B 16.10
Flange connection standard: ASME B 16.5
Pressure and temperature class: ASME B 16.34
Test standard: API 698

V. Material of main parts

NO.	name of parts	materials	name of parts	materials
1	valve body	WCB	nameplate	304
2	valve seat	A105+HF	gasket	304 stainless steel + flexible graphite
3	gate flap	WCB+F6	valve cover	WCB
4	valve stem	WCB	double-screw bolt	A193B7
5	gasket	A276410	nut	A1942H
6	nut	A276410	rings	A291035
7	pin roll	A276410	gasket	1008
8	rivet	304	plug screw	A276410