Hattersley Fig 861 PN16 Wafer Check Valve

The Resideo Braukmann BS300 backflow preventer offers reliable protection against back pressure, backflow, and back siphonage for fluids classified up to category 4. This device is essential for maintaining the integrity of drinking water systems.

For further information on backflow prevention, we invite you to explore our informative article in the Technical section of our website.

**Product Specifications**

**Sizes Available:** 2.1/2", 3", and 4" in stock (6" and 8" available to order)
**Connections:** Flanged PN10
**Materials:** Ductile iron housing, powder coated with polyamide
**Suitable Medium:** Drinking Water
**Inlet Water Pressure:** 1.5 to 10 Barg
**Maximum Water Temperature:** 60°C
**Notes:** WRAS approved

The Hattersley Fig 775 PN10 Automatic Air Vent safely removes trapped air from single or multi-boiler and calorifier systems, simplifying venting and saving time and costs. WRAS approved for closed circuits, with an optional ½" shut-off valve (specify when ordering Fig. 776).

Features & Benefits: Removes trapped air, simplifies venting, saves time/costs, WRAS approved, optional shut-off valve, meets BS EN 1074-4.

Specification: Brass body & cover, polypropylene float, EPDM seals, BSP parallel thread, optional ½" shut-off valve.

Pressure/Temperature Rating: 10 bar at 120°C.

The Emerson Kunkle Model 337 safety relief valve is designed to safeguard low to medium pressure, high volume blowers, compressors, conveying systems, and bulk hauling trailers and equipment.

As part of our service, we offer complimentary setting and testing of the valve, along with a pressure test certificate for your peace of mind.

**Key Features:**

- **High Capacity Design:** The large nozzle facilitates an impressive flow rate.
- **Enhanced Performance:** Flat bronze valve seats are precision-lapped for optimal functionality.
- **Easy Adjustability:** The warn ring allows for precise opening with minimal pre-opening or simmer.
- **Alignment Correction:** A pivot mechanism between the disc and spring compensates for misalignment and spring side thrust.
- **Manual Testing Convenience:** The Model 337 features a 'lift-pin' device for straightforward manual testing.
- **Robust Construction:** Comes standard with a bronze nozzle and disc, with optional stainless steel trim available.
- **Thorough Inspection:** Each valve undergoes rigorous testing and inspection for pressure settings and leakage.

**Specifications:**
Material: Body - Cast Iron / Nozzle - Bronze
Sizes Available: 2" to 3" (DN50 to DN80)
Connections: NPT Male Inlet x NPT Female Outlet or BSPT Male Inlet x BSPT Female Outlet
Orifice Sizes: 2" - 1.916 Sq. in. / 2.5" - 2.786 Sq. in. / 3" - 4.037 Sq. in.
Medium: Air
Pressure Range: 0.07 to 4.1 barg (1 to 60 psig)
Temperature Range: -29°C to 208°C (-20°F to 406°F)