Gate Valve Standard Features

CAST STEEL
GATE VALVES - STANDARD FEATURES

[VALVE DIMENSIONS] | [STANDARD MATERIALS] | [STANDARD FEATURES]
FUNCTION
PK gate valve is characterized by a sliding wedge which is
moved by actuator perpendicular to the flow direction. There
are a variety of valve sizes and types. The valve is used
primarily as a stop valve to open or close fully. Normally it
works for slurries, viscous fluids etc., but not for throttling. The
A.
gate valve usually has a minimum pressure drop in full open
and a tight seal in full close, and therefore there is little
possibility that contaminates may enter the valve.
S.
BODY AND BONNET
The body and bonnet is designed to achieve most uniform
distribution of stress on all sides and minimum turbulence and
resistance to flow. The bonnet on valve is equipped with back
seat ring up to 12" for Class 150 & 300 and up to 10" for Class
600 or higher. The yoke is cat integrated with the bonnet.
BODY-BONNET JOINT
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Body-bonnet jointed of gate valve is machined as follows:
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Class 150 Plain faced
Class 300 and 600 Male and female
Class 900 and higher class Ring Joint
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We can supply any kinds of gaskets as required by customer.
WEDGE
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The valve is normally supplied with a solid flexible wedge of

which the cross section is tapered H shape. All wedged are
fully guided. The flexible wedge is cast or machined with
circumferential groves to allow the seating faces to move
independently and adjust the movement of body seat. It is
used where the line load of thermal expansion of system may
distort the seating face of valve, and especially useful to
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prevent sticking that may happen in case the valve is closed at

a hot temperature and opened at a cold temperature. Ideally
the wedge is suitable for steam and other high temperature
service.
SEAT RING
The seat ring as a welded-in type is designed to prevent any turbulence and damage by corrosion. It is are forged or rolled
one piece for all dimensions, heat treated to obtain the desired surface hardness and cleaned toughly before assembly.
STEM
The stem connection to the wedge shall have an integrated tee head (without welding) and is rectified in the packing are to
ensure a long life and perfect tightness. Though experiments, we have calculated and checked the connections between
stem and wedge not to disengage the stem from wedge while gate valve is working. The strength of stem and wedge
connections is stronger that that of stem alone at the root of thread.
PACKING
ABLCORP
The packing size S.AtoLOS
is designed TILOS
secure 124 SALAMANCA
maximum DE the
tightness along MONTERRICO TELFS.
stem, and the 4376796/4374765
standard packing is a non-asbestos
type. We can supply and kinds of packing as required by customer.
YOKE SLEEVE
The yoke sleeve is designed to able to be disassembled without discounting bonnet and stem, and provided with ball
bearing of 14" or over for Class 150~300 valve, 6" or over for Class 600, and 2" or over for Class 900~1500.
GLAND
The gland is made of two pieces. Packing gland is in contact with the packing which is connected to gland flange though
spherical joint. Particular design permits a correct pressure on the packing without any damage to stem due to friction or
corrosion.
STUFFING BOX
The snuffing box give maximum packing stem seal. Lantern ring and grease injectors shall be furnished only if specified on
the purchase order.
HAND WHEELS
Hand wheels are designed for easy operation. With gearing, motor actuator or cylinder actuator, it is also available or more
difficult services.
A.
BOLTS AND NUTS
Bolts and nuts are made from four different types of steel materials in conformity with the ASTM specifications:
S.
1. A307 GRADE B: It has a minimum tensile of strength of 55,00 psi ( 3870kg/mm^2). The nuts normally used with the
machine bolts are hot pressed steel conforming to ASTM specification A307, which usually applied to hinge bolts and
nuts.
2. A193 GRADE B7/B16: It usually retains the strength well at an elevated temperature and offers higher resilience to
creep that any other high grade steel used as bolting materials. The steel is regularly used in bonnet bolts.
3. CARBON STEEL: It is used in hand wheel nuts, set screws, or nipples.
END CONNECTORS
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In our standard production of valves, the flange ends ( RF.FF ) and the face dimensions conform to ANSI B16.5 and ASME
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B16.10, respectively, and they have a raised face serrated finish type of other finish type as requested. For butt-welded
ends (B.W), of which the end to end dimension conform to ASME B16.10, customer must specify the schedule type
required ,pipe class, or core diameter.
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Ring joint ends (R.T.J) conform to ASME B16.5 and the end to end dimensions follows ASME B16.10.
The other special end connections may be supplied as required by customer.
GEAR OPERATED VALVES

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valves can be supplied with gear operators.
MOTOR OPERATED VALVES

Valves can be supplied with actuators, either electric or pneumatic, according to customers' requirements.
ACCESSORIES
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We can supply a valve fitted with accessories such as bypass, locking device, chain wheel, extension stem, etc.
For more details, please call.
PACKING AND GASKET MATERIAL

Packing material supplied in standard valves is non-asbestos graphite, with braided graphite rings and die-formed rings
configured to provide reliable and long-lasting performance. Braided rings are coated with zinc dust to inhibit corrosion. Die
formed rings are 98% carbon (minimum) and have 50PPM chloride 550 PPM sulfur content.
For standard valves, gasket materials are as follows:
CLASS 150 : graphite sheet type with 304 stainless steel tangled insert. ( 1.6 mm minimum overall thickness )
CLASS 300 : spiral wound 304 stainless steel and graphite
CLASS 600 : same as class 300 or 900
CLASS 900 and 1500 : ring joint
SEAL AREA DESIGN

PK cast steel valves are designed and manufactured to satisfy strict requirements in order to prevent external leakage and
to meet fugitive emission requirements of most customers.
ABLCORP
Stuffing box finishes of 63 S.A LOSRMS,
to 125 TILOS 124
stem SALAMANCA
finished of 16 to DE MONTERRICO
32 RMS TELFS. 4376796/4374765
control of staginess and concentricity of stems, and
controlled diametrical clearances between stem and gland, stem and backseat, and gland and stuffing box, all combine to
guarantee consistent performance of stem seals.
Gasket surfaces between bodies and bonnets are strictly controlled to fines guarantee consistent sealing in gaskets areas.
A.
S.
P
R
O
LC
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ABLCORP S.A LOS TILOS 124 SALAMANCA DE MONTERRICO TELFS. 4376796/4374765

Gate Valve Standard Features

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Gate Valve Standard Features

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CAST STEEL

GATE VALVES - STANDARD FEATURES

We can supply any kinds of gaskets as required by customer.

The valve is normally supplied with a solid flexible wedge of

prevent sticking that may happen in case the valve is closed at

GEAR OPERATED VALVES

valves can be supplied with gear operators.

MOTOR OPERATED VALVES

PACKING AND GASKET MATERIAL

SEAL AREA DESIGN

ABLCORP S.A LOS TILOS 124 SALAMANCA DE MONTERRICO TELFS. 4376796/4374765

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