We at Hawk Pumps offer a variety of unloader valves, safety valves, pressure regulating vales and zero pressure regulator valves for our pumps

Unloader Valves

The unloader valves regulate the pressure of a high pressure cleaner. When the gun is shut off, the water flow is by-passed at reduced pressure. Hawk offers a wide range of unloader valves.

VBRS Unloader Valves

VBRS Unloader Valves

Model

Volume

Pressure

Inlet

Outlet

By-pass

5H-2403.05

25 L/min

210bar

2 x G 3/8F

G 3/8M

2 x G 3/8F

VBH Unloader Valves

VBH Unloader Valves

Model

Volume

Pressure

Inlet

Outlet

By-pass

5H-2403.70

25 L/min

310bar

G 3/8M

G 3/8M

G 3/8F

Pulsar Zero Unloader Valves

Pulsar Zero Unloader Valves

  • Flow sensitive unloader valve with knob
  • Body made of brass, internal parts in stainless steel
  • Has 2 by-pass ports
  • Max temperature of 90ºC

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.2400.00

9-40 L/min

280bar

G3/8BspF

G3/8BspF

2x G3/8BspF

Pulsar RV Unloader Valves

Pulsar RV Unloader Valves

  • 2 by-pass ports
  • Suitable for recycled water and strong detergents
  • Max temperature of 90ºC

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.0008.65

40 L/min

280bar

2x 3/8NptF

3/8NptF

2x 3/8NptF

Pulsar Zero Unloader Valves

VB7 Unloader Valves

  • Body made of brass, internal parts in stainless steel
  • With knob

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.0700.00

30 L/min

220bar

3/8 Bsp M

3/8 Bsp F

3/8 Bsp F

VB350 Unloader Valves

VB350 Unloader Valves

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.1700.00

40 L/min

350bar

3/8 Bsp M

3/8 Bsp F

1/2 Bsp F

VBXL Unloader Valves

VBXL Unloader Valves

Model

Volume

Pressure

Inlet

Outlet

By-pass

5H-2403.50

50 L/min

210bar

G 1/2F

G 1/2M

G 1/2F

VB85.280R Unloader Valves

VB 85/280 R Unloader Valves

  • Suitable for recycled water and strong detergents
  • Max temperature of 90ºC

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.0423.60

80 L/min

280bar

1/2BspF

1/2BspF

1/2BspF

VB33 Multi Gun Unloader Valves

VB 33 Multi Gun Unloader Valves

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.1850.50

80 L/min

280bar

1/2 Npt F

1/2 Npt F

1/2 Npt F

VB53 Unloader Valves

VB 53 Unloader Valves

  • 500bar Unloader Valves
  • Stainless Steel

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.1470.00

80 L/min

500bar

1/2BspF

1/2BspF

1/2BspF

VB200 Unloader Valves

VB200/150 Unloader Valves

VB200/150 Unloader Valves
(With Hand Wheel)

Model

Volume

Pressure

Couplings

5C-60.5000.15

200 L/min

150bar

1″ BspF

VB200.280 Unloader Valves

VB200/280 Unloader Valves

Model

Volume

Pressure

Couplings

5C-60.4300.00

200 L/min

280bar

1″ BspF

VB450.200 Unloader Valves

VB450/200 Unloader Valves

Model

Volume

Pressure

Inlet

Outlet

By-pass

5C-60.4020.00

450 L/min

200bar

1/4 BspF

1/4 BspF

1/2 BspF

Safety Valves / Pressure Relief Valves

A safety valve serves a similar purpose to a safety dump valve. When there is a pressure spike in the system, the safety valve, opens and releases water in order to relieve the pressure and thereby protect the pump. However, unlike a safety dump valve, it does not stay open and the unit can continue to be run. Water may appear to ‘drip’ from the valve as it releases pressure every time there is a pressure spike – this is normal.It is also known as a pressure relief valve.

Please note, the valves supplied are not pressure adjusted. They become a safety device only when adjusted by the installer of the machine.

VS Pressure Relief Valve

VS Pressure Relief Valve

Model

Volume

Pressure

Inlet

Outlet

5H-2402.04

30 L/min

220bar

G 3/8F

2x G 1/4F

VSA Pressure Relief Valve

VSA Unloader Valves

Model

Volume

Pressure

Inlet

Outlet

5H-2403.38

30 L/min

220bar

Ø 11.5mm

∅ 11.5mm

VS240 Safety Valve

VS240 Safety Valves

  • Central Body in Brass
  • Ball seal made of Polyacetalic
  • 60ºC – 140ºC

Model

Volume

Pressure

Inlet

Shutter

5C-60.1580.00

24 L/min

240bar

3/8 NptM

Delrin Ball

VS500 Safety Valve

VS500 Safety Valve

  • Central body and fittings in brass
  • Internal components in stainless steel
  • 90°C – 195°C

Model

Volume

Pressure

Inlet

By-pass

5C-60.5200.00

80 L/min

500bar

1/2BspF

3/8BspF

VS200/180 Safety Valve

VS200/180 Safety Valve

  • Central body and fittings in brass
  • Internal components in stainless steel
  • 90°C – 195°C

Model

Volume

Pressure

Inlet

By-pass

5C-60.5100.00

200 L/min

180bar

G3/4F

G1/2F

Safety Dump Valves

A safety dump valve serves a similar purpose to a safety valve. When there is a pressure spike in the system, the safety dump valve, opens and releases water in order to relief the pressure and thereby protect the pump. However, unlike a safety valve, it stays open until the unit has been switched off.

Please note, the valves supplied are not pressure adjusted. They become a safety device only when adjusted by the installer of the machine.

VS28 Safety Dump Valve

VS28/2 Safety Dump Valve

  • Central body constructed from brass
  • Stainless steal ball sealing
  • 108 °C Temperature

Model

Volume

Pressure

Inlet

Outlet

5C-60-0555.20

12-16 L/min

100-250bar

1/4 BspM

16mm hose barb

Pressure Regulating Valves

The VRP 175 is a compensated pressure regulating valve with double connection for inlet port. It regulates the bypass of the fluid with a minimum variation of the pressure. It is also suitable to be used as a safety valve.

Please note, the valves supplied are not pressure adjusted. They become a safety device only when adjusted by the installer of the machine.

VRP175 Pressure Regulating Valve

VRP175 Pressure Regulating Valve

  • Constructed from stainless steel and brass
  • Multiple connections for quick installation
  • 90°C – 195°C Temperatures
  • Suitable for use with multiple lances

Model

Volume

Pressure

Inlet

By-pass

5C-60-0545.00

200 L/min

150bar

2x 1″ BspF

1″ BspF

Zero Pressure Regulator Valve

Zero Pressure Regulator Valves

 

Zero Pressure Regulating Valve

The Zero Pressure Regulator offers an unique approach to chemical metering into pumping systems using pressurized water supplies. Unlike conventional water supply regulators, this valve works on the “demand” principle.

When the pump starts, a negative pressure is instantly generated in the pump’s suction line. This negative pressure reacts on the regulator’s diaphragm to open the supply valve and allow water to flow to the pump. As the vacuum reaches 5″Hg, the regulator will balance and hold this negative suction line pressure. A built-in return check valve allows the suction to balance out at the normal water supply pressure.

Even if the incoming water supply pressure varies, the Zero Pressure Regulator will maintain a precise vacuum level which is used to draw chemical into the system. Only a precision chemical metering pump is more accurate than this valve.

The body is constructed from brass, the diaphragm housing is in stainless steel, while the diaphragm is made from nylon reinforced Buna. Internal valve parts are Nickel plated for durability.

This model is a weep-type and is suitable for car washes.

Flow Regulator Check Valves

Non-return valves and check valves are flow regulating valves which allows a one-way flow, preventing back flow.

VNR-I Check Valve

VNR-I Flow Regulator Check Valves

  • Constructed from stainless steel
  • Allows for rapid intervention with a minimal flow variation
  • 90°C – 195°C Temperatures

Model

Volume

Pressure

Inlet

Outlet

5C-60.2070.00

80 L/min

150bar

G1/2FF

G1/2FF

5C-60.2080.00

180 L/min

150bar

G3/4FF

G3/4FF

Chemical Metering Valves

RD3 Chemical Metering Valve

RD3 Chemical Metering Valves

  • Body constructed from Brass
  • Shutter constructed from Stainless Steel
  • Seals are Teflon
  • 40ºC – 105°C

Model

Volume

Pressure

Couplings

Hose Barb

5C-29.0945.00

10 L/min

28bar

1/4BspMM

7mm

RDY-90C Chemical Metering Valve

RDY-90° Chemical Metering Valves

  • Body constructed from Brass
  • Shutter constructed from Stainless Steel
  • Seals are Teflon
  • 40ºC – 105°C

Model

Volume

Pressure

Couplings

Hose Barb

5C-29.0945.00

10 L/min

28bar

1/4BspMM

7mm

Thermo Protector Valve

VT6 Thermo Protector Valve

VT6 Thermo Protector Valve

  • Inlet pressure reducer
  • 63°C Temperature

Model

Pressure

Inlet

Hose Barb

5C-60.0630.00

10bar

1/4BspM

7mm

Quick Links
Custom Design

Hawk have an enviable reputation for being able to custom design solutions for local problems. All equipment is manufactured at the Durban factory where quality and practicality are always considered. The resulting solutions are designed to be robust enough for the tough African market.

Our Guarantee

Precision engineering and the use of high quality materials have enabled Hawk in South Africa to give a comprehensive guarantee to cover their products. A full one year’s warranty covers the workmanship and materials against defects (excluding wear and tear items) on all manufactured units.

Non-foaming Oil

Hawk Non-Foaming OilHawk Oil has been developed in conjunction with a leading oil manufacturer for the Hawk range of high pressure piston pumps. The Hawk oil is non-foaming, thereby reducing the amount of bubbles in the oil, and the amount of air in the bearings. This in turn increases the lubricating properties of the oil. The lack of emulsifiers in the oil reduces its ability to become milky in humid conditions.