Pressurized Enclosure Purge System | Intelligent Explosion-Proof Pressurization Solution
Our professional pressurized enclosure purge system complies with GB/T3836.5-2021. It fully ventilates the cavity before startup and maintains stable positive pressure to block flammable gases. Adopting fully pneumatic modular design without external power supply, it supports 0-99 minutes adjustable purge time. Made of 316 stainless steel with IP65 rating, it fits explosion-proof motors and serves petroleum, chemical, metallurgy and other hazardous industries to guarantee operational safety.
Modular Pressurized Purge Equipment | Low Maintenance & Cost-effective Explosion-Proof Solution
The modular pressurized enclosure purge system features split components for easy inspection and part replacement, cutting later maintenance costs. The fully pneumatic structure avoids circuit faults and ensures long service life.
Its 316 stainless steel shell resists corrosion for outdoor use. It removes dust, condensed water and oil inside motors, protecting and maintaining equipment to reduce loss and balance safety and benefits.
Параметры настройки (4)
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We customize purge flow ranging from 200 to 12000 NL/min for explosion-proof motors of various volumes. It meets diverse ventilation standards and air source demands for full-range industrial working conditions.
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The purge time is adjustable from 0 to 99 minutes. Complying with GB/T 3836.5-2021, it calculates ventilation volume based on motor cavity volume to ensure complete gas replacement.
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Multiple NPT thread sizes including 1/8, 1/2, 1 and 2# are available. It fits global pipeline standards and connects with existing on-site pipes without extra renovation.
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Users set high and low pressure alarm thresholds and differential pressure values. It complies with safety interlock rules for Zone 1 and Zone 2 flammable gas hazardous areas.
Basic Introduction of Positive Pressure Enclosure Purge System
The positive pressure purge device is applicable to all positive pressure enclosure type motors used in explosive hazardous environments. The system performs rapid purging before motor startup to effectively displace flammable and explosive gases trapped inside the equipment cavity. Purge flow rate and duration are generally tested and preset by the motor manufacturer.
After completing the ventilation purge cycle, the system switches to automatic leakage compensation mode, which automatically adjusts pressure according to pressure fluctuations within the motor housing. The automatic compensation system maintains continuous stable positive pressure inside the equipment, preventing external flammable and explosive gases from infiltrating the motor cavity after startup.
Once the motor enters leakage compensation mode, it can be started and stopped at any time without repeating the purge process. The positive pressure system monitors cavity pressure in real time during equipment operation; operating status can be remotely transmitted via dry contact switch signals and indicated by local signal lamps.
This system consists of two components: a control unit and an RLV pressure relief unit.
Basic Technical Parameters
The TYPZ explosion-proof positive pressure purging system bears explosion-proof mark Ex db eb [pxb Gb] IIC T6. Both enclosure and junction box reach IP65 protection class. Its 316 stainless steel housing delivers outstanding corrosion resistance. Adopting 4-CLAPS automatic leakage compensation operation mode, it matches clean, dry, oil-free compressed air or inert gas with supply pressure 4-10 bar and gas impurity particle size ≤5μm. Purge time ranges 0-99 minutes adjustable by motor model. It provides complete leakage compensation flow specs with max flow 5000 NL/min under 5 barg inlet pressure. The unit shall be vertically installed per drawings, ideal for positive pressure protection of various explosion-proof motors.
Installation Diagram of TYPZ Series Purge System
- Rigid metal pipes are recommended for gas pipeline connections. The air supply pipes and fittings are specified as follows:
- Model 1ZY & 2ZY Series: 1/2″ Female NPT threaded connection, minimum air supply pipe size 15 mm (1/2″);
- Model 6ZY Series: 1″ Female NPT threaded connection, minimum air supply pipe size 25 mm (1″);
- Model 8ZY Series: 2″ Female NPT threaded connection, minimum air supply pipe size 50 mm (2″);
Gas signal pipe: 1/8″ Female NPT.
- Install the pressure relief unit at a proper position with the exhaust port pointing downward.
Indication & Control:
The system operating status is displayed locally via indicator lights on the control unit, while remote signal transmission is realized through dry switch contacts.
Local Indication of TYPZ-6ZY:
Black / Yellow: System Purge Timing Inactive / System Purge Timing Active
Remote Control Wiring of TYPZ-6ZY
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Alarm / PressurizationWhen terminals 1#–3# are closed, the internal cavity pressure of the motor exceeds 150Pa. When the pressure drops below 150Pa, terminals 1#–3# open, which can be used as the low cavity pressure alarm and motor shutdown signal. Under this condition, motor interlock terminals 7#–9# open synchronously. Terminals 1#–2# perform opposite switching logic to terminals 1#–3#.
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Intermediate Pressure AlarmWhen terminals 4#–6# are closed, the motor internal cavity pressure is higher than 500Pa. When the pressure falls below 500Pa, terminals 4#–6# open to output a low pressure warning signal. Terminals 4#–5# have inverse logic compared with terminals 4#–6#.
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Motor InterlockWhen terminals 7#–9# are closed, the system enters automatic leakage compensation mode and the motor is permitted to start and operate. When terminals 7#–9# open, the motor shuts down. Terminals 8#–10# share identical signal logic with terminals 7#–9#.The system purge signal output is an optional function, which is not configured by factory default.
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System purge signal output is optional and disabled by factory default.
Indication & Output
Schematic Diagram of System Status Indication
The TYPZ positive pressure purging system is equipped with a standard system status display circuit, covering six full operating states: Ventilation Not Timing, Ventilation Timing, Allow Start, Medium Pressure Alarm, Low Pressure Alarm, Interlock Shutdown. Multi-circuit contacts of low pressure alarm, motor interlock and start permission realize logic interlock, with terminals 1-2,1-3,4-5,4-6,7-9,8-10 switching on and off separately. Dual-color indicators clearly reflect working conditions: red light for pressure fault, green for normal air supply, yellow for ventilation timing, enabling on-site staff to quickly identify interlock and alarm signals and guarantee safe start-stop control of explosion-proof equipment.
Dimensions & Specifications:Users May Select the Orifice Plate of the RLV Pressure Relief Valve According to the Flow Rate.
The TYPZ series positive pressure purging system has 3 specifications: 2ZY, 6ZY and 8ZY, adopting a modular split design of main system and relief valve (RLV) for flexible installation adaptation. The main system width ranges from 400mm to 850mm, height from 400mm to 570mm, with configurable ports from 1/2 NPT to 2 NPT. Matching relief valves grow in size with model upgrades; the heaviest version has a 20kg main body and a 60kg relief valve with robust structure. The whole series features standardized connection group dimensions to fit pipeline layouts of diverse explosion-proof scenarios. Its modular design enables separate maintenance of the control unit and relief valve, and flexible adaptation to installation spaces, making it a versatile pick for industrial explosion-proof positive pressure protection.
Application Fields & Scenarios of Positive Pressure Enclosure Purge System
- Oil refineries: Prevent oil gas from entering motor cavities via pre-purge
- Chemical parks: Continuous pressure compensation for long-term stable operation
- Coal chemical bases: Protect devices in dense flammable gas environments
- Metallurgical workshops: Ventilate and seal motors under high temperature
- Power stations: Monitor pressure difference of motors in distribution rooms
- Port storage areas: All-weather protection for outdoor explosion-proof motors
- Intrinsic Safety Design: The fully pneumatic structure requires no external power supply, completely eliminating ignition risks such as electric sparks and short circuits. It is applicable to all Zone 1 and Zone 2 flammable gas hazardous areas to meet intrinsic safety standards.
- Multi-level Explosion-proof Protection: Equipped with pressure relief and flame arresting units to block flames and high-temperature particles. It keeps the cavity pressure difference above 50Pa as national standard, preventing flammable gas from entering motors steadily.
- Complete Safety Interlock: Integrated with pressure monitoring, multi-stage pressure alarm and motor interlock. It locks motor startup when purging is unfinished or pressure is abnormal, avoiding explosion risks for continuous production.
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