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QYK-208-002 Pressure Switch - 7/16-20UNF Female, R-134a, 2.69MPa HP/0.2MPa LP OFF

Model: QYK-208-002; Thread: 7/16-20UNF Female; Compatible Refrigerant: R-134a; Switch points: HP OFF=2.69MPa, LP OFF=0.2MPa; Working pressure: Dual high-low grade; Temp range: Ambient -30°C~+80°C, Medium -50°C~+120°C; Electrical rating: 125VA (24Vac), 375VA (120/240Vac); Life cycles: 30k/50k/100k optional; Burst pressure: 5000PSI.

Model:
QYK-208-002 Pressure Switch
Brand:
SHINE
Code:
20221165


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Product Description

QYK-208-002 Dual Pressure Switch (R-134a Compatible)

A specialized dual high-low pressure control solution, QYK-208-002 is optimized for R-134a systems with a 7/16-20UNF female thread. It integrates precise dual-pressure protection to safeguard HVAC and refrigeration equipment, combining reliability, compatibility, and seamless integration.

Core Advantages

Dual-pressure protection: 2.69MPa high-pressure (HP) OFF prevents overpressure damage, 0.2MPa low-pressure (LP) OFF avoids under-pressure failures, covering full-range system safety.
R-134a optimization: Tailored for R-134a refrigerant, ensuring stable performance and corrosion resistance in dedicated cooling circuits.
Easy installation & durability: 7/16-20UNF female thread enables secure connection to standard pipelines. Sealed structure enhances leak-proof performance, with wide temperature tolerance adapting to diverse working environments.

Key Specification Table

Parameter	Details
Model	QYK-208-002
Thread Interface	7/16-20UNF Female
Compatible Refrigerant	R-134a
Switch Action Points	HP OFF: 2.69MPa; LP OFF: 0.2MPa
Operating Temperature	Ambient: -30°C~+80°C; Medium: -50°C~+120°C
Electrical Capacity	125VA (24Vac); 375VA (120/240Vac)
Service Life Cycles	30,000/50,000/100,000 times (optional)
Burst Pressure	5000PSI

Working Principle

Equipped with dual internal reversible stainless steel diaphragms. When pressure reaches 2.69MPa (HP), the corresponding diaphragm flips to trigger OFF; when pressure drops to 0.2MPa (LP), the low-pressure diaphragm activates OFF. As pressure returns to normal ranges, diaphragms auto-reset, restoring system operation—achieving full-range auto-protection without manual intervention.

Application

Key Application Scenarios

R-134a HVAC Systems

Ideal for commercial air conditioning units, heat pumps, and central cooling systems using R-134a. Dual-pressure protection safeguards compressors and pipelines from extreme pressure fluctuations, ensuring stable operation in office buildings, shopping malls, and industrial facilities.

R-134a Refrigeration Equipment

Suitable for medium to large-scale refrigeration systems, cold storage, and commercial display freezers with R-134a refrigerant. The 7/16-20UNF female thread fits standard industrial pipelines, while dual-pressure control prevents compressor burnout and refrigerant leakage, maintaining consistent cooling efficiency for food storage, pharmaceutical cold chains, and retail refrigeration.