YSF4II series pressure relief valves with φ80mm and φ130mm diameters
YSF4II series pressure relief valves with φ80mm and φ130mm diameters are mainly used in liquid-filled main insulation transformers, instrument transformers, on-load tap changers, high-voltage switches and other electrical products. When a fault occurs inside the electrical equipment, the valve will open to release the internal pressure; when the internal pressure drops to the closing pressure of the valve, the valve will reliably close, preventing external moisture and impurities from entering the equipment.
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Product Description
Product Introduction
The YSF4II series pressure relief valves with φ80mm and φ130mm diameters are mainly used for liquid-filled main insulation transformers, instrument transformers, on-load tap changers, high-voltage switches, and other electrical products. When a fault occurs inside the electrical equipment, the valve will open to release the internal pressure; when the internal pressure drops to the closing pressure of the valve, the valve will reliably close, preventing external moisture and impurities from entering the equipment.
Conditions of Use
Installation location: On the oil tank cover, on the riser, or on the side wall of the upper part of the oil tank;
Environmental requirements: -30℃～50℃; Operating environment requirements: -30℃～+115℃.
The sealing value is an important parameter for selecting a pressure relief valve for a transformer.
(Note: The sum of the highest normal pressure value that appears when the pressure relief valve is in operation plus 7 kPa should be less than the sealing value of the pressure relief valve).
Model Description
*Note: D- indicates directional oil spraying, K- indicates electrical signal, SK (or KK)- indicates dual electrical signals, J- indicates mechanical signal, TH- indicates for humid and hot regions, TA- indicates for dry and hot regions, T- indicates for dry and humid hot regions, B- indicates with a locking device.
Example of marking: YSF4II-55/130KKJBTH refers to a type 4 pressure relief valve with a φ130mm oil spray diameter, an opening pressure of 55 kPa, with mechanical and dual electrical alarm signals, for use in humid and hot regions, and with a locking device.
Product Appearance and Dimensions
Unit (units) mm
| Oil Spray Diameter | D | D1 | D2 | D3 | D4 | H1 | E | F | H | Valve Seat Mounting Bolts Diameter × Quantity |
| φ80 | φ122 | φ133 | φ149 | φ170 | φ200 | 56 | 150 | 14 | 185 | M12×6 |
| φ130 | φ176 | φ181 | φ199 | φ235 | φ260 | 60 | 180 | 18 | 196 | M16×6 |
Contact Capacity and Wiring Diagram
| Power Type | Voltage (V) | Current A | |
| Resistive Load | Inductive Load | ||
| AC | 220V | 5 | 3（cos φ=0.4） |
| DC | 0.3 | 0.05（T=7ms） | |
Product Wiring Diagram
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