A stop valve is a kind of valve system that completely stops the flow of liquid through a pipe as a result stop valves are generally used in important machinery or a human workstation. A stop valve may be manual operated or an automated system. Manual stop valves generally have a screw handle to stop and allow the fluid to flow through the pipe, which is most common in many pipe systems.

1. Manufactured by maniks
http://www.maniks.com/stop-valves.html

2.  Introduction:
 Maniks Stop Valve
 Maniks Stop Valve introduction
 Features of Stop Valve
 DESIGN:Connections
 Valve Cone
 Spindle And Packing glands
 Installation
 Technical Data
 Special Services
http://www.maniks.com/stop-valves.html

3. http://www.maniks.com/stop-valves.html
 Maniks Stop Valve:

4.  Maniks Stop Valve Introduction:
 MSVA Stop Valves are available in angle-way and
straight-way versions and with Standard neck
(MSVA-S). The stop valves are designed to meet all
industrial refrigeration application requirements
and are designed to give favourable flow
characteristics and are easy to dismantle and repair
when necessary.
 The valve cone is designed to ensure perfect
closing and withstand a high system pulsation and
vibration, which can be present specifically in the
discharge line.
http://www.maniks.com/stop-valves.html

5.  Features of Stop Valve:
 Applicable to HCFC, HFC, R717 (Ammonia) and R744 (CO2).
 Can be used in chemical and petro-chemical applications.
 Modular Concept :
◦ Each valve housing is available with several different
connection types and sizes.
◦ Possible to convert MSVA-S any other product in the MSVL
family (regulating valve, stop check valve, check valve or
strainer) just by replacing the complete top part.
 Fast and easy valve overhaul service. It is easy to replace the
top part and no welding is needed.
http://www.maniks.com/stop-valves.html

6.  Features of Stop Valve:
Optional accessories :
◦ Heavy duty industrial hand wheel for frequent operation.
◦ Cap for infrequent operation.
 Available in angle-way and straight-way versions with Standard neck
 Each valve type is clearly marked with type, size and performance
range.
 The valves and caps are prepared for sealing, to prevent operation
by unauthorized persons, using a seal wire.
 Internal metal back seating:
http://www.maniks.com/stop-valves.html

7.  DESIGN:-Connections:
 Butt-weld DIN (EN 10220)
 Butt-weld ANSI (B 36.10 Schedule 80), DN 15 - 40 (¼ - 1½
in.)
 Butt-weld ANSI (B 36.10 Schedule 40)
 DN 50 - 150 (2 - 6M)
 Socket Weld (ANSI B 16.11), DN 15 - DN 50 (½ - 2 in.)
 Outside pipe thread
 G ½ in. - G 7 - 8 in. (ISO 228/1)
 FPT Female Pipe Thread, NPT (ANSI/ASME B 1.20.1),
 DN 15 - 32 (½ - 1¼ in.)
http://www.maniks.com/stop-valves.html

8.  Valve Cone:
 The valve cone can be turned on the spindle. Thus
there will be no friction between the cone and the
seat when the valve is opened and closed and the
special design will avoid cone spin due to pulsation
and vibration when the valve is in open position. A
Teflon tightening ring provides perfect sealing with
minimum closing force.
http://www.maniks.com/stop-valves.html

9.  Spindle:
 Made of polished stainless steel, ideal for leap seal sealing.
 Packing glands:
 The low temperature packing gland ensures a perfect
tightness in the range: –60/+150°C (–76/+302°F). The
packing glands are equipped with a scraper ring to prevent
penetration of dirt and ice into the packing gland.
http://www.maniks.com/stop-valves.html

10.  Installation:
 It is recommended that the valves be installed in the direction
of flow indicated by the arrow on the valve body. The valve
can be installed in the opposite direction but this slightly
reduces the Kv-value (Cv-value). The valve is designed to
withstand high internal pressure. However, the piping system
in general should be designed to avoid liquid traps and
reduce the risk of hydraulic pressure caused by thermal
expansion.
 For further information refer to installation instructions for
MSVA.
http://www.maniks.com/stop-valves.html

11.  Technical Data:
 Refrigerants: Applicable to HCFC, HFC, R717 (Ammonia) and
R744 (CO2). For further information please see installation
instruction for MSVA.
 Temperature range: 60/+150°C (–76/+302°F).
 Max. Working pressure 52 bar g (754 psi g).
http://www.maniks.com/stop-valves.html

12. http://www.maniks.com/stop-valves.html