Cách thức hoạt động:

Double eccentric design: stem center offset body center + offset seat center.
Action Mechanics:
- The disc is completely disengaged from the seat when opened, reducing friction and operating torque.
- The disc gradually engages the seat when closed to avoid extrusion damage.
Thermally compensated design: Lower stem disc springs allow thermal expansion and provide continuous grounding

The particularity of the packing design

Deep stuffing box:
- Tetrafluoroethylene (TFE) V-shaped filler (long life).
- High temperature compression packing (applicable ≤ 750°F)
- Stainless steel fasteners as standard.
- Optional fillers:
Đóng gói hàng sống:
- Optional configurations for enhanced sealing and controlled fugitive emissions (API 641 certified).
Inverted packing configuration: suitable for vacuum conditions.

Seat type	Vật liệu bịt kín	Peculiarity	Pressure/temperature resistance	Tiêu chuẩn chứng nhận:
S02	TFM polymers	Bi-directional sealing, pressure-responsive sealing lip; Chemical resistance (except alkaline solutions)	740 psi, -46~260°C	ASME/FCI 70-2 Class VI
F02	Stainless steel + TFM inserts	Fireproof design, metal-to-metal triple seal; Two-way fire certification	1,480 psi, -46~260°C	API 607 4th Edition
M01	316 Stainless Steel (Full Metal)	ultra-high temperature applications; Washout resistance	The rated pressure of the same valve body is up to 750°C	ASME/FCI 70-2 Class IV

Chất liệu thân máy:
- Carbon steel (A216 WCC): Standard operating conditions.
- Low-temperature carbon steel (LCC, ASTM A352): -46°C low-temperature condition.
- Stainless steel (316/CF8M): corrosive media or high temperature.
Key Component Materials:
- Stem: 17-4PH stainless steel (≤650°F) → Nickel-based alloy for high temperature (UNS 7718/5500).
- Disc: Hard chrome plated stainless steel (anti-wear).
- Bearings: Teflon+ steel (standard) or Teflon+ 316SS (high temperature)

Conventional media: water, oil, steam, gas, slurry.
Special working conditions:
- High temperature: steam, hot oil (≤750°F, M01 seat required).
- Vacuum: Absolute pressure 20 μm (S02/F02 seat).
- Sulfur Condition: Complies with NACE MR0175 (H₂S Corrosion Resistance).
- Low temperature: -46°C (LCC body).

Tham số	Standard value	Remark
Maximum temperature	750°F（399°C）	M01 seat + nickel-based alloy stem required
Highest pressure	Class 300 Body: 740 psi (ambient)	Seat-limited (e.g., S02 seat up to 740 psi)
Fire rating	F02 Seat: 1,480 psi + 30 minute fire certification	API 607 4th Edition

Đặc điểm	S02 Valve Seat (TFM)	F02 Seat (Metal+TFM)	M01 Valve Seat (Full Metal)
Loại dùng để làm kín	Class VI (Zero Leakage)	Class VI (Zero Leakage)	Class IV (Low Leakage)
Khả năng chịu áp suất	740 psi	1.480 psi	The rated pressure of the valve body
Giới hạn chịu nhiệt	260°C (intermittent 500°F)	260°C (intermittent 500°F)	399°C（750°F）
Fire certification	KHÔNG	API 607 bidirectional certification	KHÔNG
Phương tiện truyền thông áp dụng	Chemicals, vapors (≤200 psi)	High-pressure steam and fire risk working conditions	UHT steam/hot oil