Miniature Relief Valves

Pneu-Hydro miniature relief valves provide zero leakage up to cracking pressure. They reseal bubble-tight within 5% to 10% of cracking pressure. Adjustments are insensitive to temperature variations.

These miniature relief valves are made from 316 stainless steel for strength and corrosion resistance. Material options can be provided on request. Buna-N or Viton O-rings are standard but other O-ring materials can be provided. Back-pressure on the 405 and 407 series (with connected vent line) should be limited to 1,000 psid.

Specifications

Operating pressure ranges
404 and 405 series	50 to 5,000 psid
406 and 407 series	5,000 to 13,000 psid
Cv	.035
Operating temperature ranges
Buna-N seals	-40° to 250°F (-40° to 121°C)
Viton seals	-20° to 450°F (-29° to 232°C)

Ordering Information

Pressure Range	Vent to Atmosphere		1/4 NPT Vent Connection
Pressure Range	Buna-N	Viton	Buna-N	Viton
50 – 100 psid	404M4Q-10	404M4Q-10V	405M4Q-10	405M4Q-10V
100 – 150 psid	404M4Q-1	404M4Q-1V	405M4Q-1	405M4Q-1V
150 – 250 psid	404M4Q-2	404M4Q-2V	405M4Q-2	405M4Q-2V
250 – 350 psid	404M4Q-3	404M4Q-3V	405M4Q-3	405M4Q-3V
350 – 600 psid	404M4Q-4	404M4Q-4V	405M4Q-4	405M4Q-4V
600 – 900 psid	404M4Q-5	404M4Q-5V	405M4Q-5	405M4Q-5V
900 – 1,500 psid	404M4Q-6	404M4Q-6V	405M4Q-6	405M4Q-6V
1,500 – 3,000 psid	404M4Q-7	404M4Q-7V	405M4Q-7	405M4Q-7V
3,000 – 5,000 psid	404M4Q-8	404M4Q-8V	405M4Q-8	405M4Q-8V
5,000 – 13,000 psid	406M4Q	406M4Q-V	407M4Q	407M4Q-V

Notes:
Material and connection options are also available. Consult factory.
Optional materials include brass and aluminum.
Optional connections include MS-33656-4.

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Inline Relief Valves

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Right Angle Relief Valves

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