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Dalian Chiyoda Precision Machinery Co., Ltd.
Address: No. 18-6, Jinwan South Road, Export Processing Zone, Dalian Bonded Zone
Tel: +86-411-8731-8601
Fax: +86-411-8731-8776

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The principle and troubleshooting of check valves

A check valve, also known as a non-return valve, is often used in parallel with an electronic expansion valve (or capillary tube) in air conditioning systems to control the forward and reverse flow of refrigerant, allowing refrigerant to flow only in a specified direction.

A check valve consists of a nylon valve needle, valve seat, stop ring, and housing. The direction of refrigerant flow is usually indicated by an arrow on the outer surface of the check valve.

As shown in the figure below, the check valve allows refrigerant to flow in only one direction. If the refrigerant flows in the opposite direction of the arrow, the valve body and valve seat will contact, closing the circuit and stopping the refrigerant flow.

Check valves are generally installed vertically with a bottom inlet and top outlet. They are mostly used in heat pump air conditioners, in parallel with an electronic expansion valve or capillary tube.

The independent R&D capability of globe valves directly affects the competitiveness of enterprises

Characteristics and Applications of Check Valves

【Acceptance Announcement】Completion Acceptance Monitoring Report on Environmental Protection for the Relocation Project of Dalian Chiyoda Seiki Co., Ltd.

In accordance with the State Council's Decision on Amending the Regulations on Environmental Protection Management of Construction Projects Upon Completion (State Council Order No. 682), and the Ministry of Ecology and Environment's Announcement on the Issuance of the Provisional Measures for the Acceptance of Environmental Protection Upon Completion of Construction Projects (Guo Huan Gui Huan Ping [2017] No. 4), the Completion Environmental Protection Acceptance Monitoring Report for the Relocation Project of Dalian Chiyoda Seiki Co., Ltd. is hereby publicized as follows:

2022

01-04

China's gate valve industry is working hard to develop new products with independent intellectual property rights

China's stop valve industry has developed to the point where, although there is still a gap with the international advanced level, it has surpassed the stage of simply copying and absorbing.

2022

01-04

The independent R&D capability of globe valves directly affects the competitiveness of enterprises

Valve manufacturers vary widely in terms of production scale and technological level, but their globe valve products share many commonalities in overall development trends and technological approaches.