HXRK/XYRK/GYXA/explosion-proof flame retardant breathing manholes are safety emergency ventilation devices installed on the top of storage tanks for petroleum, chemical and other materials. It is usually used in conjunction with a breathing valve to avoid sudden overpressure or vacuum in the tank caused by accidents, which can serve as a pressure relief or gas suction function. It adopts an all-weather sealing structure and adjusts the opening and closing of the suction valve disc and pressure relief cover with counterweight. It has the characteristics of constant pressure discharge, constant pressure suction, flexible opening and closing, and safety and reliability.

Working principle of explosion-proof and flame retardant breathing manhole:

The HXRK/XYRK/GYXA/explosion-proof flame-retardant breathing manhole is basically in a sealed state when the breathing valve is working normally, and the storage tank is at normal pressure. When the normal operation of the breathing valve cannot meet the sudden overpressure of the storage tank caused by unexpected reasons, The HXRK type pressure relief cover automatically opens for emergency pressure relief, maintaining normal pressure inside the tank; When the pressure inside the tank drops sharply or exceeds the vacuum, the suction valve opens to rapidly inhale the atmosphere and maintain the normal pressure inside the tank to protect the safety of the storage tank. The difference is that the HXRK model can both inhale and emit; The XYRK model can only be discharged and cannot be inhaled. Users are advised to make a distinction when selecting it.

Applicable scope and working principle of HXRK/XYRK/GYXA/explosion-proof flame retardant breathing manhole

Technical performance of explosion-proof and flame retardant breathing manhole:

1. Operating pressure: Positive pressure: 1961Pa (+200mmH20), negative pressure: 392Pa (-40mmH20), or both positive and negative pressures can be specified by the user.

2. Operating temperature: -30 ℃~+60 ℃