what is the proper type water valve that is the main shut off in a house

The first valve inside of a house after it comes in through the foundation. Is a gate valve the right one or which one?
either a gate or ball valve you could use a globe but it will restrict
flow some what i prefer ball as they are quicker to shut off in a
emergency.
Years ago it would have been a gate valve. Now, ball valves are used
since they last longer without leaking and do not get clogged up and
made unable to close properly.
Use a Ball Valve designed for water. They usually have a blue handle. Gate valves tend to leak and get stuck.
From the original1gatevalve
.

Features of hydraulic gate valve

The hydraulic gate valves are widely used in the automatic
control systems and remote control systems, featuring the hydraulically
controlled opening and closing, stable performance and easy operation.
Typical gate valves should never be used for regulating flow, unless
they are specifically designed for that purpose. On opening the gate
valve, the flow path is enlarged in a highly nonlinear manner with
respect to percent of opening. This means that flow rate does not change
evenly with stem travel.
Features of hydraulic gate valve can be summarized as:
1) Hydraulic actuator installed on the top of the bonnet with controls the open and close of the valve by hydraulic pressure;
2) Metal seal between the body and bonnet;
3) Backseat seal between the stem and the bonnet, easy for the change of sealing stuff under pressure; 
4) Sealing surface is hard-faced or the QBQ with the performance of anti-corrosion, wear-resistance;
5) Low operating torque.
From the original1gatevalve
.

Resilient seated gate valve briefly the main purpose

Main purposes:
     1. Thrust bearings to reduce friction to reduce operating torque
     2. Three Ο-ring can significantly reduce water leakage, and in the case of the pressure and constant water replacement “O” ring
     3. Double tooth type stem, can reduce generation of operating torque
     4.
Inside and outside with rubber laminating pressure designed to avoid
loss due to prolonged use without the valve at the bottom of the groove,
not easy to siltation caused by debris
     5. Valve in vivo using non-toxic powder epoxy resin coating to enhance corrosion resistance capabilities, improve water quality
     6. Embedded copper nut, not easy to loose and damaged
     7. European rubber vulcanization technology to ensure the skills of rubber elasticity
     User requirements can be twisted roots of various electric actuator equipped to realize remote control and automatic control. Sensitive, reliable, easy installation and so on. Can
be widely used in tap water, sewage, construction, petroleum, chemical,
food, medicine, textile, electric power ships, metallurgy, energy
systems, fluid lines and the closure as a conditioning device. RVEX electric resilient seated gate valve, electric resilient seated gate valve, resilient seated gate valves.
From the original1gatevalve
.

Installing Slide Gate Valves

Slide gate valves are used to control water
pressure. Due to constant pressure of the water, there are possibilities
of wear and tear of any part of the valve or the valve itself. It is
recommended that they be checked properly to make sure that everything
is fine and should be replaced at the earliest if there are any damages
to make sure that there are no major problems.

Step 1: Turn off the Water Supply

Turn off the water supply from the main on both sides from the water
meter. Place a bucket and a rag underneath the valve so that you can
catch any water that might flow out.

Step 2: Loosen the Nut

Use an adjustable wrench to hold the valve housing firmly. Use an
open-ended wrench to make the compression nut loose so that if there is
any water pressure, all the water will leak out completely.

Step 3: Loosen the Bonnet

Take an adjustable wrench to remove the stem, which enters into the
valve’s housing. If it is screwed then you need to make sure that the
housing is held firmly with the wrench and using a proper sized open
wrench, you need to turn the bonnet.

Step 4: Take out the Bonnet

Carefully take out the bonnet from the gate valve housing making sure
that the disk comes out along with the bonnet from the housing.

Step 5: Replace the Valve

Replace the valve if there are any damaged seats, or clean the seats
of the valve using a rag. Damage can include any chipped or broken edges
or any sort of wear and tear of the disk.

Step 6: Replace the Disk Slot if Needed

Check the disk slot to see if there is any damage. If there is any
damage then replace the disk slot by sliding the stem out from the slot.

Step 7:  Replace the Stem if Needed

If the stem does not turn properly or if it sticks then you can replace the stem. Some stems can be unscrewed from the bonnet.

Step 8: Reassemble the Gate Valve

The gate valve needs to be reassembled properly by sliding the bonnet
along with the disk and stem into the housing. You need to make sure
that while tightening it you do not apply too much pressure. If you
notice this, then the valve is not sticking. Use an adjustable wrench to
tighten the bonnet and the compression nut.

Step 9:- Check the Valve

Check the valve by turning the supply of water once again to make
sure that everything is fine and that there are no leaks. If there is
any leakage, turn the water supply off, fix the part that is leaking and
check again until satisfied.
From the originalgatevalve
.

ANSI Gate Valve classification

A gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restric*tion is desired. According to the different standard, we can divide gate valves into JIS Gate Valve, GB Gate Valve, ANSI Gate Valve, and DIN Gate Valve and so on. Because all of them are one kind of gate valve, so they contain all the features of gate valve.
 Would it be wise to replace all of the gate valves with ball valves in a house?
Most older houses have gate valves (the old style where you twist several times to open and close) rather than the newer ball valves that turn water on and off in a quarter turn. Gate valves lose their ability to cut off water supply completely, they leak, and even when fully open they have a water flow loss. Ball valves solve all of these problems, making gate valves obsolete.
In my opinion, it would be the plumbing equivalent of changing electric fuse boxes to circuit breaker panels.

From the originalgatevalve

Stainless steel valves in the new size

Applications include deionized water, vegetable oil, fuel oil, gas,
steam, solvents, cryogenics and oxygen. The gate valves are not stuffing
construction with continuous duty coils for all AC and DC voltages
success or failure of the 150 - and 300-pound bracket.
Omega-SV-1200 of miniature solenoid valves are suitable for
applications in analytical technology and reliable handling difficult
liquids such as acids, alkalis, pharmaceuticals and biotechnology in the
fluid process.
Thermal insulation of the reader and provides accurate measurement
for liquid applications. Other features include universal functions,
size, and a fast and easy connection to reduce the electrical
installation. An LED indicator provides a safe and convenient control.
Each valve is manufactured and tested in the following quality
assurance standards, where production operations under the supervision
of our dedicated and experienced.
Many funding streams are composed of a single vertical line followed
by a single horizontal line. If the horizontal line has a considerable
length, the speed is equal to or greater than the speed necessary to
monitor the saltation phase dilute flow in the pipeline. A significant
reduction in the rate of flow is necessary to dilute phase can be
achieved by maintaining the horizontal line should slope downward as in
Figure 1. A low angle of only 15 degrees is enough to significantly
reduce the rate of force to prevent the release on line.
Since it is difficult to maintain solid dilute phase mode in a
horizontal line, as in a vertical line, the speed is greater than the
saltation velocity choke. The report of the mutation rate of speed of
suffocation in the range of 3 to 6 This means that the minimum system
requirements for speed in a system of horizontal and vertical lines in
promoting the overall speed of saltation. Many people try to reduce the
diameter to increase the horizontal lines at the gas velocity and gas
volumetric requirements of the system reduces to a minimum. However,
reducing the diameter of the horizontal lines also increases the mass
flow of solids in the pipeline, which means that the mutation rate
increases and usually results in no net “profit” by reducing the
diameter line.
Many applications of solids pneumatic conveying of solids are
required to be taught in the dilute phase mode. In many of these
applications, the transport system tire vertical and horizontal lines.
The minimum speed necessary to maintain the solids in the dilute phase
mode in a transmission line known as the vertical velocity of
suffocation. The minimum speed necessary to maintain the solids in the
dilute phase mode in a horizontal section is called saltation velocity.
From the originalgatevalve
.

Introduction to Alternatives to Gate Valves in Stormwater and Wastewater

Stormwater and wastewater (sewage) systems can be built as separate
or combined facilities. The more modern houses and businesses now have
separate piping systems for sewage and stormwater, while some cities are
upgrading their present combined systems due to the occurrences of
spillage of sewage into the environment following a rainstorm. This
spillage can be from overflow at the wastewater plant or from regulators
in the piping system, but both measures involve dumping raw sewage into
the local environment.
This happens because of a combined plant’s inability to process the
additional stormwater and sewage at the same time, preventing a
back-flow of sewage to the local houses.

This is an article on flow control of drainage from wastewater and
stormwater systems, in particular from combined sewage systems. We begin
with a look at the some of the problems with a combined sewage plant
and then move on to the control of outflow.
As we have seen the combined wastewater and stormwater plants are
being phased out in favor of a separate plant for each process, however
many major cities of the developed world do still use this system. This
is mainly because sewage and stormwater collection in the same piping
system was acceptable in the early 1900’s. However, as the city
populations increased, the sewage plants could not handle both sewage
and stormwater drainage, and thus we have the current problem of
controlling the inflow, processing, and outflow from a combined sewage
processing plant.
To overcome the problem of sewage overflow from current plants, some
plants install large underground storage tanks to hold the influx of
stormwater and sewage, which is then processed later. Tunnels at the
gate valve facility have also been used to store and treat drain water and sewage influx following rainstorms.
In order to have separate processing facilities, the stormwater and
wastewater must be collected by two separate systems; one for sewage and
grey water,
and one for rainwater drains. In most cities with combined sewer
systems, it is difficult to convert to separate systems, but many cities
in the US and Europe are converting a little at a time.
In the developing countries, there is little effort to treat sewage.
80-90% of sewage is pumped directly into rivers, lakes, or the sea; the
majority of Sub-Sahara countries are without any sewage processing
facilities.
From the originalgatevalve
.