Hattersley Fig 973W PN16 Double Regulating Valve

Specification

Sizes: 1/2" Connections: Screwed BSPP or NPT Materials: Stainless Steel (24.2) Disk: Metal, PEEK or Vespel (depending on pressure) Joints & Seals: FPM Medium: Liquids Set Pressure: 30 to 670 Barg Temperature: 0 to 100°C Design: Please note: The temperature range applies to valves fitted with a metal disk.

This spring-operated liquid relief valve features a cartridge-type assembly that can be easily withdrawn from the body without disturbing the spring setting, thus relieving pressure efficiently. This innovative design allows for the cleaning of seating surfaces without the need to reset the valve, making maintenance straightforward and hassle-free. Commonly used with positive displacement pumps for relief or bypass applications, the spring cartridge assembly can also be supplied separately for integration as a pump bypass relief valve. Furthermore, the spindle is equipped with an ‘O’ ring to safeguard the spring, especially in corrosive environments.

Specifications

Sizes: 3/4", 1", 1.1/2", 2"
Connections: BSP Male Inlet x BSP Female Outlet
Materials: Bronze body
Disc: Bronze
Joints & Seals: Nitrile spindle O ring
Medium: Liquids
Set Pressure: 0.35 to 24 Barg
Temperature: -20 to +120 °C
Max Design: Notes:

The PREL100016 High Capacity Sealed Heating System Pressure Relief Valve discharges water off the system at a set pressure in the event of system over pressurisation (high for larger capacity systems) Reliance Valves 100 Series Pressure Relief Valves are made from hot pressed brass and are predominantly used to protect closed-circuit wet heating systems from overpressure. The outlet is one size larger than the inlet to ensure high discharge flow rates. It has a separate seal seating from the diaphragm to give improved scaling resistance and a cover which is made from OT58 brass. Available in a variety of sizes to suit most installations, it also has a pressure range from 2.5 - 5.0 bar, with the response pressure indicated on the twist cap. The valve size is determined by the heat output of the boiler as shown in the maximum heating capacity table. 

Features and benefits: 

- High flow design for larger capacity systems 

- Outlet is one size larger than the inlet for high capacity discharge 

- Provides protection against over pressurisation in wet heating systems 

- Diaphragm design gives improved resistance against scale 

- Cartridge design gives ease of service and replacement without the need to reset the response pressure 

- Set pressure range from 2.5 - 5.0 bar to suit any system requirement 

- High lift design for increased discharge capacity 

- Suitable for heating applications only 

Specification

Size: 3/4" x 1"Connections: BSP Female Inlet x BSP Female OutletMaterials: Hot pressed DZR BrassMedium: WaterSet Pressure: 4 Barg Temperature: +140 degCProduct Code: PREL100016Notes: WRAS approved