A real Hopeet safety valve cut in half, showing the spring chamber, threads and seat

Safety valves · air vents · cryogenic valvesMade here. Tested here.

Safety valves from ⅛″ compressor fittings to DN150 boiler valves, cryogenic valves rated to −196 °C and the first air vent built for liquid-cooled AI servers.

19product lines
−196 °Cdown to
300 °Cup to
S10 · S10L — Safety valve S10 · S10L Safety valve Our everyday safety valve — bronze or stainless, sealed or with a test lever.
Pressure
0.5–20 kg/cm² (bronze) · 0.5–40 kg/cm² (stainless)
Temperature
−50 to 200 °C (Viton −40 °C)
Sizes
½″ – 2″ threaded
FGX · FGXL — High-lift stainless safety valve FGX · FGXL High-lift stainless safety valve High lift for more capacity — threaded, inlet-flanged or flanged both ends.
Pressure
0.5–20 kg/cm² CE · up to 200 kg/cm² on request
Temperature
−50 to 230 °C
Sizes
½″ × 1″ – 2″ × 2″
SU · SUL — Full-lift safety valve SU · SUL Full-lift safety valve The valve from our scroll story — full lift, full capacity, all stainless.
Pressure
0.5–25 kg/cm² (varies by size)
Temperature
−50 to 230 °C
Sizes
½″ × 1″ – 2½″ × 2½″
SL-5 · SL-6 — Low-lift flanged safety valve SL-5 · SL-6 Low-lift flanged safety valve Flanged safety valve for boilers and pressure vessels, DN25 to DN150.
Pressure
FC 0.3–10 · WCB 0.3–20 · SUS 0.3–20 kg/cm²
Temperature
−5 to 300 °C
Sizes
DN25 – DN150
SF-1 · SF-2 · SF-13 · SF-14 — Full-bore flanged safety valve SF-1 · SF-2 · SF-13 · SF-14 Full-bore flanged safety valve Large full-bore valve for boilers and high-pressure vessels, up to 40 kg/cm².
Pressure
FC 0.3–10 · WCB 0.3–40 · SUS 0.3–40 kg/cm²
Temperature
−5 to 300 °C
Sizes
Throat Ø15 – Ø38 mm
MC-K — Refrigerant safety valve MC-K Refrigerant safety valve Compact brass relief valve for refrigerant vessels and receivers.
Set / range
70–580 psi (max. inlet 600 psi)
Temperature
−40 to 149 °C
Sizes
¼″, ⅜″ PT
MC-A — Cryogenic relief valve MC-A Cryogenic relief valve Marshall relief valve for LNG, liquid oxygen, nitrogen and argon down to −196 °C.
Set / range
75–500 psi (max. inlet 600 psi)
Temperature
−196 to 74 °C
Sizes
¼″, ⅜″, ½″ NPT / PT
ASV — Server-grade air ventWorld first ASV Server-grade air vent World first: an air vent built for liquid-cooled AI servers.
Pressure
Max. 20 bar
Temperature
Max. 200 °C
Sizes
G ⅛″ – G ½″ · 7/16″ – 7/8″ UNF
AEV · AEVS — Automatic air vent AEV · AEVS Automatic air vent Lets air out of water and oil lines — never the liquid.
Pressure
Max. 20 bar
Temperature
Max. 200 °C (stainless float) · 100 °C (PP float)
Sizes
⅜″ – 1″ PT, NPT, PF
ABV · ABVS — Breathing valve ABV · ABVS Breathing valve Vents air out, and lets air in when the line goes under vacuum.
Pressure
Max. 20 bar
Temperature
Max. 200 °C (stainless float) · 100 °C (PP float)
Sizes
⅜″ – 1″ PT, NPT, PF
MRVC — Cryogenic pressure regulator MRVC Cryogenic pressure regulator Compact high-pressure, low-flow regulator for cryogenic lines.
Set / range
20–600 psi (max. inlet 600 psi)
Temperature
−196 to 65 °C
Sizes
½″ NPT
CVM — Cryogenic check valve CVM Cryogenic check valve High-flow, zero-leak check valve for LNG tanks and vehicle cylinders.
Pressure
Max. 3000 psi (stainless) · 1000 psi (brass)
Set / range
Opening 0.1–10 psi
Temperature
−196 to 80 °C
PRV — Direct-acting pressure reducing valve PRV Direct-acting pressure reducing valve Steps line pressure down and holds it steady — stainless, ½″ to 2″.
Set / range
Outlet 1–5 or 5–10 kgf/cm² (max. inlet 20)
Temperature
−15 to 100 °C (Viton) · 101 to 200 °C (FFKM)
Sizes
½″ – 2″ PT (DN15–50)
Y-CCV · Y-CCS — Y-type pneumatic control valve Y-CCV · Y-CCS Y-type pneumatic control valve Air-operated angle-seat valve for water, air, steam and oil.
Pressure
0–16 kg/cm² · pilot air 3–10 kg/cm²
Temperature
0 to 180 °C
Sizes
¼″ – 2½″
ND-6000 · ND-6000M · NDL-6000 — 6000 psi stainless needle valve ND-6000 · ND-6000M · NDL-6000 6000 psi stainless needle valve Fine flow control for instrument and high-pressure lines.
Pressure
6000 psi
Sizes
⅛″ – 2″
Materials
CF8M body, SUS316 spindle, PTFE packing

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Catalogue

Every drawing, every dimension.

The 2026 catalogue has full dimension tables, material lists and order codes for every line.

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