Hattersley Fig 250CW PN16 Double Check Valve

A marine self-closing lever valve is a manually operated valve featuring a spring-loaded lever mechanism that automatically returns to the closed position once the operator releases the lever. These valves are essential in scenarios where a brief, controlled release or sampling of fluids is required — particularly in marine settings to ensure safety and protect the environment.

Purpose of a Self-Closing Lever Valve

• Enables controlled manual release or draining of liquids.
• Safeguards against accidental or unattended open positions.
• Commonly utilised in:
  • Fuel and oil drain lines
  • Tank sampling points
  • Bilge or sludge drains
  • Lube oil system drains

We supply self-closing lever globe valves and flushing valves from several leading manufacturers. Please get in touch with us for your specific requirements.

**Medenus S50 Gas Safety Shut-Off Valve Description** The Medenus S50 Gas Safety Shut-Off Valve is designed to swiftly terminate gas flow when the outlet pressure in the regulation section either exceeds or falls below predetermined safety thresholds. To ensure accurate monitoring, the outlet pressure is conveyed to the SSV control device via a dedicated measurement line. As pressure changes occur, the diaphragm within the control device adjusts accordingly, activating the shut-off mechanism. Should the outlet pressure dip below the lower switch-off point or surge above the upper switch-off point, the switch socket linked to the SSV diaphragm will shift to the disengaging position. This action releases the SSV screw spindle, allowing the closing spring to press the SSV valve plate firmly against the valve seat, effectively sealing off the gas flow with precision. It’s important to note that the SSV can only be manually opened and locked in the open position. For this to occur, the outlet pressure at the measuring point must be reduced below the upper response pressure or increased above the lower response pressure by at least the required re-engaging differential amount (Δp). The SSV is suitable for use in either functional class A (with diaphragm rupture protection) or class B (without diaphragm rupture protection), in accordance with specific national regulations. Additionally, users have the option of integrating a remote display indicating when the SSV is in the “CLOSED” position, as well as a manual and remote release feature that operates both during normal power and in the event of a power outage. **Specifications** - **Sizes**: 1", 1.5" & 2" - **Connections**: Female BSP Inlet x Female BSP Outlet - **Medium**: Gas - **Operating Pressure**: 3 Barg - **Release Mechanism**: Low pressure and high pressure - **Installation Notes**: Can be fitted in any orientation, ensuring a gas-tight zero position. This robust and reliable gas safety shut-off valve is an essential component for ensuring safe gas management in various applications.

Features & Benefits: High-quality bronze body with integral seating surfaces, inside screw pattern with non-rising stem. Kitemarked to BS EN 12288 and WRAS approved for potable water (1/2"–2") up to 85ºC.

Specification: Kitemarked BS EN 12288:2010, WRAS approved, FOCS 4PMV threaded bonnet, one-piece wedge, taper threaded BS EN 10226 (NPT optional 1/2"–4"), lockshield available up to 2".

Pressure/Temperature Rating: BS EN 12288 PN20 Series B, 9 bar at 180ºC, 20 bar from -10 to 100ºC.