Altecnic / Caleffi 311 Series Safety Relief Valve 1/2" x 1/2" F x F 3 Bar - 311430

A marine self-closing valve is an essential component designed to automatically revert to a closed position after manual operation. These valves are extensively utilised on ships to prevent unintentional fluid discharge, enhance safety, and ensure adherence to pollution and fire prevention regulations.

What is a Marine Self-Closing Valve?

This type of valve features a spring-loaded mechanism that opens upon manual activation, typically via a lever or push button, and automatically closes once the operator releases it. In its default state, the valve remains closed, thereby preventing the unintended discharge of fluids such as fuel, oil, or bilge water.

We offer a comprehensive range of Self-Closing Valves from leading manufacturers. For further information or to discuss your specific requirements, please do not hesitate to get in touch with us.

The CONCOA 401 Series six-port, chrome-plated brass barstock regulator provides single-stage primary pressure control for ultra-high purity inert, non-corrosive, or liquefied gases (up to grade 5.5). Ideal for applications tolerating minor outlet fluctuations or with constant/low inlet pressure (<500 PSIG/34 BAR), it is front-panel mountable and configurable with purge, low-pressure alarm, or multiple inlets. Key features include metal-to-metal diaphragm seal, CAPSULE® seat with 360° filtration, pipe-away relief valve, cleanroom assembly, captured vent bonnet, and helium leak-checked integrity. Specifications: max inlet 3000 PSIG (210 BAR) standard; body and bonnet chrome-plated brass; PTFE/PCTFE seats; 10 µm sintered bronze filter; 316L diaphragm; Cv 0.1; 1/4 in FNPT ports; 2 in gauges; temperature -40°F to 140°F (-40°C to 60°C). Conforms to CGA G-4.1, ANSI/ASME B40.1, PED 2014/68/EU, CRN OH5216.

**Specification** **Sizes Available:** 1/2", 3/4", 1", 1 1/4", 1 1/2", 2", 2 1/2", 3", 4" **Connections:** Flanged to DIN or ANSI standards **Materials:** Stainless Steel 316 or 304 **Disk Options:** EPDM, PTFE, or Viton **Joints & Seals:** Diaphragm options available in EPDM, PTFE, or Viton **Suitable Mediums:** Steam, Gases, and Liquids **Maximum Inlet Pressure:** 100 Barg (varies depending on size) **Outlet Pressure Range:** 0.25 to 52 Barg (varies depending on size) **Please Note:** This product is the flanged variant of the Niezgodka Type 70. This description has been designed for optimal search engine visibility, targeting key phrases related to flanged valves, materials, and pressure specifications to enhance its online presence.