Water Pressure Control Valves PRV & BPV, safety pressure relief and pilot float.
There are two main types of pressure control valve function, direct acting and pilot or pressure assisted.
Pilot Operated
Pressure Sustaining (also known as BPV back pressure valve), Pressure Reducing Valve (PRV) and Safety Pressure Relief valves utilise the pressure difference between the inlet and outlet ports to move the main gate into position via an small external pilot control valve.
The external control valve can be removed, exchanged for different operation, pressure adjusted or simply removed for easy handling, transport and installation of the valve main cylindrical body. This unique Patented compact cylindrical valve body has a rugged internal piston with U ring seal offering exceptionally good sealing, durability high flow and long maintenance free life. Typically available from DN50 to DN1000 flange with NBR or Viton sealing manufactured from either Bronze, Ductile Iron with Epoxy coating, Cast Iron, 304 and 316 stainless steel construction for the control of water and non-aggressive or corrosive fluids, gases and for stainless steel can include steam and pure water media applications.
Direct Acting
Direct acting pressure control valves operate directly and do not reply on working media pressure differences to operate. Typically available 316 stainless steel, Bronze, Cast Iron and Titanium from ½” through to 2” BSP G, NPT or PT thread or Flange DN50 to DN150, optional NBR or Viton sealing to suit most water, pure water and non-aggressive media applications, with special PTFE sealing for special media applications.
Pressure Control Basics
Pressure Reducing Valve:
will reduce and maintain a stable outlet pressure regardless of inlet upstream pressure changes. Pressure can be adjusted between minimum and maximum pressure settings with the outlet or downstream pressure displayed by a pressure gauge. Example valve outlet pressure set to 5 bar, outlet pressure will remain at 5 Bar even if inlet pressure fluctuates between 5 Bar to 15 Bar.
Pressure Sustaining Valve:
will maintain a minimum back pressure regardless of downstream demand. Pressure can be adjusted between minimum and maximum pressure settings and sustained back pressure displayed by pressure gauge. Example valve back pressure set to 4 bar, if pressure drops close to 4 bar valve will slowly close to maintain the back pressure and will open again when back pressure recovers.
Safety pressure release or relief valve is designed to stay closed until the inlet upstream pressure reaches the set limit at which point it will quickly open and release over pressure. When pressure returns within safe limit safety valve will slowly close again. Inlet system pressure will be displayed by pressure gauge.
Pressure:
Pressure reducing, sustaining and relief valves are typically offered with minimum and maximum working pressures and a maximum design pressure. For example the control pressure required must be within (ideally in the middle) of the valve adjustable range (min max) AND the valve maximum design pressure must exceed the maximum possible system pressure of the application.
Seals and chemical compatibility
Most water control valves are fitted with NBR Nitrile Buna Rubber seals which are ideally suited for water applications, Viton is an option for slightly aggressive media however it is best practise to check with your supplier beforehand especially when working with corrosive and aggressive acid and alkali media requiring more specialised PTFE sealing.
BFF Series
- Operation: pressure assisted piston
- Pressure: 0.3 to 16 Bar
- Port: DN50 to DN350mm, larger sizes upon request.
- Body: ductile iron, bronze, 304 or 316 stainless steel
- Media Temp: +80°C Max
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid.
Z Tide REMT
Micro Pressure Reducing Valves
- Function: 2/2 way normally closed
- Operation: direct acting
- Pressure:Inlet 10 bar max, Outlet 0.2 to 0.02 Bar
- Port: DN15 to DN50mm and 1/2 BSP to 2" BSP
- Body: 316 stainless steel
- Temp: -15°C to +80°C Max
- Media: water,fluid,air,oil,gas,pure water,ro water.
Z Tide RELT
Low pressure reducing valves series: RELT + RELF
- Operation: Direct Acting
- Pressure: inlet 10 bar max; outlet 1.5 to 0.2 bar
- Port: DN15 to DN50mm - 1/2BSP - 2"BSP.
- Body: stainless steel 316
- Temp: -15°C to +80°C max
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid
Pressure Gauge shows reduced downstream pressure
PRV series RET
Pressure reducing valve PRV series RET
- Operation: Direct Acting
- Pressure: Inlet 25 bar max
- Outlet (1 - 6 Bar) (4 - 10 Bar) (8 - 13 Bar)
- Port: 1/2,3/4, 1, 11/4, 11/2 and 2" BSP or NPT thread.
- Body: stainless steel 316
- Media Temp: -15°C to +80°C
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid
PRV series: REF
Pressure reducing valve PRV series: REF
- Operation: direct acting
- Pressure: Inlet 25 Bar Max;
- Outlet Options: (1 - 6 Bar) (4 - 10 Bar) (8 - 13 Bar)
- Flange Sizes DN50 to DN150 PN16 Flange.
- Body: 316 stainless steel
- Media Temp: -15°C to +80°C
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid.
BFR Series
- Operation: Pressure assisted piston
- Pressure: Inlet 16 Bar Max;
- Outlet Options (0.7 - 7 Bar) (4 - 12 Bar)
- Sizes: DN50 to DN350 PN16 Flange.
- Body: Ductile Iron, Bronze, 304 or 316 Stainless Steel
- Temp: -15°C to +80°C Max
- Media: Water - liquid
RFT Series
Pressure Sustaining Valve Z-Tide Series: RFT
- Function: 2/2 way normally closed
- Operation: Direct Acting
- Pressure: Inlet 25 Bar Max;
- Outlet Options (1 - 5 Bar) (4 - 10 Bar) (8 - 13 Bar)
- Port: 1/2 BSP - 2" BSP.
- Body: 316 Stainless Steel
- Media Temp: -15°C to +80°C
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid.
Z Tide RFF Range
- Operation: Direct Acting
- Pressure: Inlet 25 Bar Max
- Outlet Options (1 - 5 Bar) (4 - 10 Bar) (8 - 13 Bar)
- Port: 1/2 BSP - 2" BSP.
- Body: 316 Stainless Steel
- Media Temp: -15°C to +80°C
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid.
BFS Series
Pressure Sustaining Valve Z-Tide Series: BFS
- Operation: Pressure assisted Piston
- Pressure:Inlet 16 Bar Max.
- Outlet Options (0.2 - 4 Bar) (3 - 10 Bar)
- Port: DN50 to DN350 Flange.
- Body: Ductile Iron, Bronze, 304 or 316 Stainless Steel
- Temp: -15°C to +80°C Max
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid
Z Tide BFE Series
- Function: 2/2 way normally closed
- Operation: direct acting
- Pressure Range: 0.3 to 10 or 0.3 to 16 Bar Max
- Port: DN50 to DN350. (Larger sizes available upon request)
- Body: Ductile Iron, Bronze, 304 or 316 Stainless Steel
- Temp: -15°C to +80°C Max
- Media: water,fluid,air,oil,RO water,pure water,gas or fluid.
RLG Series
Pressure Relief Valves Z-Tide Flanged series: RLF
- Function: 2/2 way normally closed (double outlet)
- Operation: direct acting
- Pressure range: 25 to 0.5 Bar Max
- Port: flange DN15 to DN150
- Body: 316 stainless steel
- Temp: -15°C to +80°C Max
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid.
RLT Series
- Operation: direct acting
- Pressure range: 25 to 0.5 Bar Max
- Port: 1/2,3/4,1,11/4,11/2 or 2 BSP or NPT thread
- Body: 316 stainless steel
- Temp: -15°C to +80°C Max
- Media: water,fluid,air,oil,RO water,pure water, gas or fluid.
AIF Series
Z-Tide AIT + AIF Inline Series Water Hammer Arrestors
- Pressure: 20 Bar Max Media: Fluid - Oil - Acid - Alkali
- Sizes: 1/2 BSP to 4" BSP and DN80 to DN300.
- Body: Ductile Iron Epoxy Coated and Stainless Steel 304 or 316
- emp: -15°C to +80°C Other options are custom made
AXT Series
Z-Tide AXT L Series Water Hammer Arrestors
- Pressure: 12 Bar Max
- Sizes: 1/2 BSP to 3/4" BSPM
- Body: Brass (Nickel Plated)
- Temp: -15°C to +110°C Other options are custom made
- Media: Water - Fluid - Oil