Vacuum Valves

1)Low vacuum : Choose gate valves, butterfly valves, check valves etc., with rubber seals, low cost.

2)Medium vacuum : Choose angle valves, baffle valves with metal-rubber combined seals, with a leak rate ≤10⁻⁷ Pa・m³/s.

3)High vacuum : Choose baffle valves, gate valves with all-metal seals, with a leak rate ≤10⁻¹⁰ Pa・m³/s and low flow resistance.

There is no fixed schedule; it depends on working conditions:

1)For regular working conditions (normal temperature, non-corrosive, low frequency of operation): Rubber parts should be replaced every 1-2 years; diaphragms should be replaced as soon as signs of aging (hardening, cracks) appear.

2)For harsh working conditions (corrosive, high temperature, high frequency of operation): Inspect every 3-6 months, and replace immediately if damaged or ineffective.

1)Manual: Suitable for low-frequency operation and simple systems, with low cost and no need for automation.

2)Pneumatic: Suitable for medium-to-high frequency operation, requiring rapid response, or explosion-proof/dusty environments, and dependent on an air source.

3)Electric: Suitable for systems requiring precise control and high automation, capable of remote programming, with higher cost.

1)Appearance: Check for rust, cracks, and loose components.

2)Seals: Dismantle and inspect O-rings and diaphragms; replace if aged or damaged.

3)Cleaning: Wipe the sealing surfaces and valve seats with alcohol, remove rust, and clean.

4)Moving parts: Test whether the opening and closing are flexible without jamming.

5)Leak detection: Perform vacuum leak detection after assembly to ensure tightness.

1)Dry dust: After disassembling the valve, purge with low-pressure compressed air, clean residual dust with a soft brush, then rinse with alcohol and let dry.

2)Sticky/oily impurities: After disassembling the valve, wipe with alcohol/neutral cleaning agent; stubborn impurities can be soaked before cleaning, and finally rinsed and dried.