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1 setting and operating spring loaded valves, 8 integral pressure relief valves – Viking Pump TSM285: Classic+ Lobe Pump User Manual

Page 10

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SECTION TSM 285

ISSUE

A

PAGE 10 OF 36

The selection, setting and application of integral relief valves is

influenced by the viscosity and nature of the pumped media, the

pumps operating speed and the required pressure relief setting

and mode of operation. For these reasons and to cover the

diverse range of products, the conditions under which they are

pumped and application demands, it is not practical to factory-

set integral relief. Valves and the setting of the valves should

be carried out on site, under the proposed duty conditions for

which the pump and valve were selected.
For setting and operating Classic+ integral relief valves refer

to sections 3.8.1 and 3.8.2. Before beginning the relief valve

setting procedure the pump should be installed, refer to section

3.3.1, paragraph (vi), with a pressure gauge in the discharge

line adjacent to the pump discharge port.

3.8.1 SETTING AND OPERATING

SPRING LOADED VALVES

See Figures 11, 12 and 13.
- Remove cover (108). For integral relief valve with manual lift,

see Figure 12; first remove nut (129) and hand wheel (111).

- Unscrew nut (107) using pry bar in holes

provided to relieve spring compression. For

integral relief valve with airlift, see Figure 13,

the air cylinder must be exhausted prior to

unscrewing the nut (107).

- Start pump. - refer to section 3.4.
- Screw in nut (107) using pry bar in holes provided until the

required pressure relief setting is reached.

Note: Care should be taken not to exceed the

lower of either the pump’s maximum pressure

rating or the system design pressure.

- Reinstall cover (108). For integral relief valve with manual

lift, see Figure 12; reinstall hand wheel (111) and nut (129).

- The relief valve is now set.
For Integral Relief Valve with Manual Lift - see Figure 12.
- To operate the manual lift, turn the hand wheel (111) clockwise,

which will lift the valve head (102/128). To resume normal

relief valve operation, turn the hand wheel (111) counter-

clockwise.

For Integral Relief Valve with Air Lift - see Figure 13.
- To actuate the airlift, connect an air supply not exceeding

7 Bar (102 psi) to the cylinder (123), connection ‘B’, which

will lift the valve head (112). To resume normal relief valve

operation, exhaust the cylinder (123).

3.8.2 SETTING AND OPERATING

AIR LOADED INTEGRAL

PRESSURE RELIEf VALVES

See Figure 14.
- Connect an air supply, not exceeding 7 Bar (102 psi), via

a regulating valve to the relief valve connection ‘A’ in the

cylinder (114). Do not turn on the air supply.

- Start the pump, refer to section 3.4.
- Using the regulating valve, gradually increase the air

pressure until required pressure relief setting is reached. The

air pressure must not exceed 7 Bar (102 psi).

- The relief valve is now set.

3.8 INTEGRAL PRESSURE RELIEf

VALVES

See Figures 11, 12, 13 and 14.
The Classic+ models CP10, CP20, CP30 and CP40 can be

supplied with integral pressure relief valves. For the CP10,

CP20 and CP30 both spring and air loaded versions are

available. The function of the valves can be further enhanced

with the option of manual or airlift override, offering particular

benefits where CIP or SIP procedures are employed. Valves

incorporating this option can be opened to regulate the flow

of the cleaning media through the pump chamber, thereby

avoiding the need for manual cleaning or external bypass.
Where the pump is mounted onto a portable base plate,

complete with motor and drive to be used as a mobile set, an

integral pressure relief valve should be installed.
The Classic+ integral pressure relief valves available include:
Spring Loaded - see Figure 11.
- Valve can be set to the required pressure relief setting.
Spring Loaded with Manual Lift - see Figure 12.
- Valve can be set to the required pressure relief setting.

Manual lift override can be used to open valve without

disturbing pressure relief setting.

Spring Loaded with Air Lift - see Figure 13.
- Valve can be set to the required pressure relief setting. Airlift

override, which operates on an air supply of up to 7 Bar (102

psi) depending on pressure relief setting, can be used to

open valve without disturbing pressure relief setting.

Air Loaded with Air Lift - see Figure 14.
- Valve, which operates on an air supply of up to 7 Bar (102

psi) regulated for required setting, can be set to the required

pressure relief setting. Airlift override, which operates on an

air supply of up to 7 Bar (102 psi) depending on pressure

relief setting, can be used to open valve without disturbing

pressure relief setting.

Air actuated relief valves can be operated remotely and inter-

faced with other elements of the system or process control.

Integral pressure relief valves are normally used

to protect the pump from the effects of increases

in system pressure caused, for example, by a

restricted or closed discharge line. In response

to a pressure increase, the valve opens and

internally circulates the pumped media within the

pump chamber. When the valve opens, because

the volume of liquid circulating is relatively small,

the temperature of the liquid in the pump chamber

may rise if the pump continues to operate for

an extended period. In severe cases, this may

result in temperatures in excess of the pumps

operating limits, or vaporisation of the liquid, both

of which should be avoided. For these reasons

when the valve is activated the cause of the

system pressure increase should be eliminated

as continuous operation of the pump with the

valve open is not recommended and may cause

severe damage to the pump.

If the pump on which the valve is fitted is to be installed within

either a pressurised system or one incorporating a vessel under

vacuum then the application of the valve should be referred to

Viking Pump.

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WARNING

WARNING