FUKUI SL431 Spring-Loaded Safety Relief Valve - 1985

ReflowX SKU: REF-1242

Product Details

Quantity

2
Availability (Lead Time)

0-2 Weeks
Product Location

United Arab Emirates
Condition

Surplus
OEM

FUKUI SEISAKUSHO CO., LTD.
Equipment code

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Short Description

Japanese-engineered FUKUI SL431 spring-loaded safety relief valve with flanged connections, API 526 design, and pressure range up to 150 bar. Ideal for steam, gas, and fluid overpressure protection.

Description

FUKUI SL431 Spring-Loaded Safety Relief Valve - 1985

The FUKUI SL431 is a precision-engineered spring-loaded safety relief valve manufactured by FUKUI SEISAKUSHO CO., LTD. in Japan, designed to protect pressurized systems from overpressure conditions. Based on API 526 and API 520 standards, the SL431 model is typically available in angle or straight pattern configurations, with flanged connections conforming to ANSI or JIS standards, ensuring compatibility across global piping systems.

This relief valve operates via direct spring actuation, opening once system pressure exceeds the preset limit. It features a metal-to-metal seat or optional soft seat (PTFE/elastomer) for tight shutoff, and can be configured with either an open or closed bonnet depending on service type (gas, steam, or liquid). The body is typically carbon steel or stainless steel, while the trim is made from hardened stainless steel, ensuring durability and high-temperature resistance.

The set pressure is customizable per client requirements (commonly from 1 bar to 100+ bar), with the design pressure rated up to 150 bar and temperature tolerance up to 400°C, depending on construction materials. Designed for low back pressure tolerance, the SL431 valve ensures reliable blowdown control (typically 7%–10%) and safety performance under extreme process conditions. All units undergo factory hydrostatic and set pressure testing in compliance with ASME Section VIII, JIS, or ISO codes and are CE/PED certified.

Specifications:
– Manufacturer: FUKUI SEISAKUSHO CO., LTD.
– Country of Origin: Japan
– Model / Type: SL431
– Serial Number: 31A2051
– Valve Type: Spring-loaded Safety Relief Valve
– Operation: Direct spring-actuated overpressure relief
– Design Pattern: Angle or Straight (based on order)
– Valve Body Material: Carbon Steel / Stainless Steel / Alloy Steel
– Trim Material: Hardened Stainless Steel or equivalent
– Seat Type: Metal-to-metal or optional soft seat (PTFE/elastomer)
– Connection Type: Flanged (ANSI or JIS standards)
– Size Range (Est.): 1" to 4" (exact bore per nameplate)
– Discharge Configuration: Open or Closed Bonnet
– Set Pressure Range: Typically 1 bar to 100+ bar (custom-set)
– Design Pressure: Up to 150 bar
– Temperature Rating: Up to 400°C (material-dependent)
– Blowdown Adjustment: Typically 7%–10%
– Back Pressure Tolerance: Atmospheric or low backpressure
– Design Standards: API 526 / API 520
– Design Codes: ASME Section VIII / JIS / ISO (as specified)
– Certifications: CE / PED (Pressure Equipment Directive)
– Testing: Hydrostatic and Set Pressure Factory Tested

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Technical Details

Year of Manufacturing	1985
ISO 15926 Pt 4	10554
Model Number	SL431
Year of Manufacturing	1985
Height	300–400 mm
Width	150–200 mm
Length	150–200 mm
Weight	10–15 kg
ISO 15926 Pt 4	10554
PCA RDS Code	RDS292589
CFIHOS ID	CFIHOS-30000660
IFC Class	IfcValve
Design Specification	Ex d (Flameproof)
Failure Action	normally closed or normally open
Full Opening Valve	Yes
Nominal Diameter	1/4" to 1/2"
Piping Class	Class 150 or Class 300
UNSPSC Code	40141600

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