Pressure and Safety Relief Valves

Kingston Valves KNG Safety Relief Valves

Pressure and Safety Relief Valves with Proven Performance.

ASME, Section I and VIII and CE Certified

The Kingston KNG Safety Relief Valves are designed for accuracy and reliability. Available in 1/2″ to 3″ NPT (D-J) orifice in brass, carbon steel, and stainless-steel materials. ASME, Section I and Section VIII National Board (NB), CE, and CRN certified for air, gas, steam, and liquid services up to 1500 PSI.

Cryogenic, Tri Clamp Connections, and Flanged Joints options available.

Series 560

ASME Section I to 250 PSI.
ASME Section VIII to 300 PSI for air/gas and 250 PSI for steam service.

Series 742

Carbon and stainless steel valve. ASME Section VIII for Air/Gas/Liquid to 1500 PSI, Steam service to 300 PSI. Closed cap option pictured.

KNG Safety Relief Valve 743 Packed Lever

Series 743

100% stainless steel valve. Shown with closed cap. ASME Section VIII for Air/Gas/Liquid to 1500 PSI. Steam service to 300 P.S.I.

Series 69

Available with stainless steel nozzle and disk. Non-code, field adjustable liquid relief valve.
Set pressures to 600 PSI.

ASME SECTION VIII FOR AIR-GAS-STEAM OR LIQUID SERVICE

 

Series 740 safety and relief valve is designed for accuracy and reliability. Engineered for heavy-duty industrial usage. Multiple purpose pressure relief valve for all services: Liquid, Steam and Air/Gas. ASME and National Board Certified for Section VIII service as well as CE and CRN certifications. Pressures are to 1500 PSI. Available with a full array of metal seating options.

SERIES 740

Brass nozzle, stainless steel ring, disc and springs. Brass / bronze body, bonnet.
350 PSI (24.1 Bar) for air/gas and liquid, 250 PSI (17.2 Bar) for steam.
Temperatures -320°F (-196°C) to 406°F (208°C)

SERIES 741

Stainless steel nozzle, ring, disc and springs. Brass / bronze body, bonnet.
1500 PSI (103.4 Bar) for air/gas and liquid, 300 PSI (20.7 Bar) for steam.
Temperatures -320°F (-196°C) to 425°F (218°C)

SERIES 742

Stainless steel nozzle, ring, disc, all internals and springs. Carbon steel body, bonnet.
1500 PSI (103.4 Bar) for air/gas and liquid, 300 PSI (20.7 Bar) for steam.
Temperatures -20°F (-29°C) to 800°F (427°C)

SERIES 743

Stainless steel nozzle, ring, disc, all internals and springs. Stainless steel body, bonnet.
1500 PSI (103.4 Bar) for air/gas and liquid, 300 PSI (20.7 Bar) for steam.
Temperatures -320°F (-196°C) to 800°F (427°C)

Usages:

Pressure Vessels, Pumps, Hydraulics, Tanks, Steam Systems, Chemical, Cryogenic, Air and Gas Compressors, Separators, by-pass and over pressure protection. Choose for most industrial applications requiring a safety relief valve.

Features:

  • Full nozzle – Top guided design
  • Short, precise blow-down
  • Wide choice of inlet/outlet sizes
  • Dual-lapped precision seating
  • 100% Back pressure tight
  • Drain hole with threaded plug
  • Cryogenic Compatible

Options:

  • O-ring seating options (see charts)
  • Packed lift lever or Closed cap
  • BSPT and BSPP Piping
  • Tri-Clamp Inlets
  • Full array of metal options
  • API 527 Seating
  • Lap Joints Flanges
  • Lead Free (D,E, and F orifice only)
  • O2 Cleaning

ASME SECTION I and SECTION VIII FOR AIR-GAS-STEAM SERVICE

Our 560 / 570 valve line is a high capacity safety valve used for boilers, piping lines and vessel protection. Designed and engineered for heavy-duty industrial use. ASME and National Board certified for Section I and VIII as well as CE and CRN Certifications.

SERIES 560

Use for ASME Section I applications, boilers, or most areas where steam safety valves are required.
Set pressure up to 250 PSI (17.2 Bar)

SERIES 563

Same as Series 560 except with Stainless Steel wetted trimming (Nozzle and Disc).
Set pressures up to 300 PSI (20.7 Bar)

SERIES 570

ASME Section VIII, CE, CRN certified for unfired vessel protection.
Used for many applications to protect or relieve pressure for Air / Gas or Steam.
Set pressures: Air up to 300 PSI (20.7 Bar), Steam to 250 PSI (17.2 Bar).

SERIES 573

Same as Series 570 except with Stainless Steel wetted trimming (Nozzle and Disc).
Set pressures for air and steam up to 300 PSI (20.7 Bar)
 

Usages:

Steam Boilers, Air Compressors, Dryers, Receivers, Pressure Vessels, Piping Systems, Accumulators, Reducing Stations, Tanks, Inter/After Coolers, Cooking Equipment, Autoclaves, Sterilizers or wherever higher capacity pressure protection or relief may be required.

Features:

  • Designed for durability
  • 6 orifices – 12 sizes of piping options
  • Top guided seating and discharge
  • Full nozzle; high capacity levels
  • Short, tuned blow-down with dual-ring technology
  • Heavy duty hood and lever mechanism
  • Standard 17-7 stainless steel springs

Options:

  • O-ring seating options (see charts)
  • Packed lift lever
  • Stainless steel trimming package, nozzle, disc (all sizes)
  • Bubble tight seating options
  • Anti-vibration spring for lift lever
  • BSPT and BSPP pipe threading
  • Tri-Clamp Inlets
  • O2 Cleaning

ASME SECTION I and SECTION VIII FOR AIR-GAS-STEAM SERVICE

Our 560 / 570 valve line is a high capacity safety valve used for boilers, piping lines and vessel protection. Designed and engineered for heavy-duty industrial use. ASME and National Board certified for Section I and VIII as well as CE and CRN Certifications.

SERIES 560

Use for ASME Section I applications, boilers, or most areas where steam safety valves are required.
Set pressure up to 250 PSI (17.2 Bar)

SERIES 563

Same as Series 560 except with Stainless Steel wetted trimming (Nozzle and Disc).
Set pressures up to 300 PSI (20.7 Bar)

SERIES 570

ASME Section VIII, CE, CRN certified for unfired vessel protection.
Used for many applications to protect or relieve pressure for Air / Gas or Steam.
Set pressures: Air up to 300 PSI (20.7 Bar), Steam to 250 PSI (17.2 Bar).

SERIES 573

Same as Series 570 except with Stainless Steel wetted trimming (Nozzle and Disc).
Set pressures for air and steam up to 300 PSI (20.7 Bar)
 

Usages:

Steam Boilers, Air Compressors, Dryers, Receivers, Pressure Vessels, Piping Systems, Accumulators, Reducing Stations, Tanks, Inter/After Coolers, Cooking Equipment, Autoclaves, Sterilizers or wherever higher capacity pressure protection or relief may be required.

Features:

  • Designed for durability
  • 6 orifices – 12 sizes of piping options
  • Top guided seating and discharge
  • Full nozzle; high capacity levels
  • Short, tuned blow-down with dual-ring technology
  • Heavy duty hood and lever mechanism
  • Standard 17-7 stainless steel springs

Options:

  • O-ring seating options (see charts)
  • Packed lift lever
  • Stainless steel trimming package, nozzle, disc (all sizes)
  • Bubble tight seating options
  • Anti-vibration spring for lift lever
  • BSPT and BSPP pipe threading
  • Tri-Clamp Inlets
  • O2 Cleaning

ASME SECTION VIII FOR AIR-GAS SERVICE

SERIES 88 / 89

Multiple purpose safety valves for air / gas protection. Designed for durability, yet an economical choice for safety and relief applications.ASME and National Board certified for Section VIII as well as CRN Certifications.
Choose for a variety of applications where mid-level capacity is required.

 

SERIES 88 / 89

Durable and economical choices for safety and relief applications.

Temperatures -60°F (51°C) to 406°F (208°C), low reduced to -320°F (-196°C) with PTFE option, high increased to 425°F (218°C) with stainless option.

Usages:

Over pressure protection, Pressure vessels, Piping systems, Tanks, Compressors, Dryers, Inter- and After-coolers.

Features:

  • Precision lapped metal-to-metal seating
  • Stainless steel springs
  • Ruggedly constructed
  • Closed seal hex cap or lever* option
  • Wide variety of inlet and outlet options
  • Disc-guided seat provides quick, accurate and excellent re-seating

Options:

  • Stainless steel body and disc
  • Chrome plating
  • Viton embedded o-ring at hex cap
  • Packed lift lever
  • Low Lead Configurations
  • Oxygen cleaning
  • Female inlet
  • BSPT and BSPP connections

Cryogenic:

  • Standard with PTFE seating
  • O2 cleaned and bagged

NON-CODE ADJUSTABLE LIQUID RELIEF VALVE, WATER RELIEF VALVE

Series 69 is an industry standard liquid relief valve used for pressure relief and by-pass.
Engineered and designed for heavy duty, industrial and commercial usages. A single piece bonnet to eliminate leakage while allowing for simple cleaning. Easy removable sealed hex-cap to adjust pressure.

SERIES 69

Series 69 Liquid Relief Valves are calibrated (set to pressure) based on a range of flow-rates (GPM) versus seat size and set pressure. Standard valve is set to pressure to achieve flow rate maximum and minimums within each set pressure range. See capacity chart for details.
Temperatures -60°F (-51°C) to 406°F (208°C), low reduced to -320°F (-196°C) with PTFE option, high increased to 425°F (218°C) with stainless option.

Liquid Relief Valve Model Choices:
Brass/bronze valve with stainless steel springs
Stainless steel body / disk and springs with bronze bonnet

Wide Range:
Series 69 is available with a wider adjustable range (as an option). Valves are set to the mid-level pressure (or as specified). Typical wide-range is 150 PSI increments. Note: Flow rates are not showing.

 

Usages:

Include liquid by-pass, regulation, continuous pressure relief and over-protection. Also used on pumping stations, tanks, hydraulics, fluid / piping lines, oil fields, gas lines where a Liquid or Water Relief Valve is needed.

Features:

  • Field adjustable by simple removal of the hex-cap
  • Metal to metal precision lapped seating
  • Back pressure tested
  • Ease of cleaning and maintenance with simple bonnet removal
  • Stainless steel springs
  • Single piece – 100% leak free bonnet
  • Cryogenic compatible

 

Options:

  • BSPT and BSPP connections
  • Female Inlet
  • Viton embedded o-ring at hex cap
  • Packed lift lever
  • Wide range (WR) adjustable (150 PSI increments)
  • Stainless steel body and disc
  • Low Lead Configurations (for a potable Water Relief Valve)
  • PTFE Seating
  • Tamper proof wire seal
  • O2 Cleaning
  • Adjustable wheel handle

SERIES 55

Series 55 are small compact non-code (liquid) water relief valves with a maximum pressure of 200 P.S.I.

View the KNG Series Catalog to browse
the full collection of pressure and safety relief valves.

To help determine which valve best suits your needs, take a look at the
Valve Selection Guide on Page 4.