We are looking to purchase expansion valves and ball valves for air-conditioning systems. Requirement details:
- Quantity: 250 pieces per size (multiple sizes required)
- Application: R22 refrigerant-based air-conditioning units
- Delivery: Before December 2023
- Budget: Flexible based on product quality and durability

Please provide specifications and compliance certifications for your valves. Material composition and pressure ratings should be clearly stated in quotations.