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밸브 VALVE
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VALVE
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CAST STEEL VALVES

Service Features

- Several trim combinations available for various services.
- Straight-through port design offering a good flow with minimum frictional loss and turbulence.
- Cast steel Valve suitable for works demanding strength, shock resistance, elongation and heat resistance.
- Bottom seating of seat rings ground accurately for maximum strength and tightness(globe).
- Bypass mounting to equalize pressures.
- Normal yoke bushing furnished with ductility resistant to high melting point of above 2200°F.
- Level and weight available to accelerate/decelerate disc closing (swing check).
- Designed for maximum flow with minimum pressure drop if possible.
- Precision-ground seating surfaces and revolving disc providing a long life.

In the refineries, power plants, utilities and petrochemical/chemical process industries, PK cast steel valve have been regarded as of great importance about their excellent performance and reliability.
By discriminatory blending of carefully selected materials combined with sound design and precision machining/assembly under strict quality controls, PK steel valve have gained general and wide acceptance.
The products are manufactured in accordance with ASTM, ANSI, or other international standards.


Cast Steel Valves Production Range


Production Materials

- Carbon Steel : ASTM A216-WCB or Equivalent
- Alloy Steel : ASTM A217-WC6, WC9, C5, C12, C12A or Equivalent
- Stainless Steel : ASTM A351-CF8, CF8M, CF3, CF3M, CN7M, or Equivalent
- Duplex Stainless Steel : ASTM A995-1A, 2A, 4A, 5A or Equivalent
- Special Alloy Steel : Inconel 625, Incoloy 825, Hastelloy C, Monel, AL-BRONZE
- ASME SA designation material(e.g ASME SA217-WC6)


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GATE VALVE


FUNCTION


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 fluid, etc.,but not for throttling. The 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 contaminants may enter the valve.

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 integrated with bonnet.

BODY-BONNET JOINT

Body-bonnet joint of gate valve is machined as follows:
Class 150 ................................... Plain faced
Class 300 and higher class ........ Male and female
We can supply any kinds of gasket as required by customer.

Features and benefits

WEDGE

The valve is normally supplied with a one-piece flexible wedge of which the cross section is a tapered H shape.
All wedges are fully guided. The flexible wedge is cast or machined with circumferential grooves to allow the seating faces to move independently and adjust the movement of body seat.
It is used where the line load or thermal expansion of system may distort the seating face of valve, and especially uesful to 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 forged or rolled type into one piece for all dimensions, heat treated to obtain the desired surface hadness, and cleaned thoroughly before assembling.

STEM

The stem connection to the wedge shall have an integrated tee head (without welding)and is rectified in the packing area to ensure a long life and perfect tightness. Through 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 than that of stem alone at the root of thread.

PACKING

The packing size is designed to secure maximum tightness along the stem, and the standard packing is a non-asbestos type. We can supply any 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 through a spherical joint. Particular design permits a correct pressure on the packing without any damage to stem due to friction or corrosion.

STUFFING BOX

The stuffing box gives maximum packing stem seal.
Lantern ring and grease injector 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 for more difficult services.

BOLTS AND NUTS

Bolts and nuts are made from four different types of steel materials in conformity with the ASTM specification:
1) A307 Grade B : It has a minimum tensile strength of 55,000 pounds per square inch (3870kg/㎟).
The nuts normally used with machine bolts are a hot pressed steel conforming to ASTM specification A307, which is 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 resistance to creep than any other high grade steel used as bolting materials. This steel is regularly used in bonnet bolts.
3) A194 Grade 2H/4 : The nuts of this grade shall be re-heated above the critical range of steel, quenched in a suitable medium, and then tempered at a temperature not less than 850°F(455°C). This steel is regularly used in bonnet nuts.
4) Carbon steel : It is used in hand wheel nuts, set screws, or nipples

END CONNECTIONS

In our standard production of valve, the flange ends(RF.FF) and the face to face dimensinos conform to ANSI B16.5 and ASME B16.10, respectively, and they have a raised face serrated finish type or other finish type as requested.
For butt-welded ends (B.W.), of which the end to end dimension conforms to ASME B16.10, customer must specify the schedule type required, pipe class, or bore diameter.
Ring type joint flanged ends (R.T.J) conform to ASME B16.5 and the end to end dimension follows ASME B16.10. The other special end connections may be supplied as required by customer.

GEAR OPERATED VALVE

Valve can be supplied with gear operators.

MOTOR OPERATED VALVE

Valve can be supplied with actuators, either electric or pneumatic, accordings to customer’s requirements.

ACCESSORIES

We can supply a valve fitted with accessories such as bypass, locking device, chain wheel, extension stem, etc. For more details, refer to the Accessories column.

PACKING AND GASKET MATERIALS

Packing material supplied in standard valve 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.
Dieformed rings are 98% carbon(minimum)and have maximum 50PPM chloride 550PPM sulfur content.
For standard valve, gasket materials are as follows;
Class 150 - graphite sheet type with 304 stainless steel tanged insert. (1.6mm 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 type joint

SEAL AREA DESIGN

Cast steel valve are designed and manufactured to satisfy strict requirements in order to prevent external leakage and to meet fugitive emission requirements of most customers.
Stuffing box finishes of 63 to 125 RMS, stem finishes of 16 to 32 RMS, control of straigntness and concentricity of stems, and controlled diametrical clearances between stem and gland, stem and backseat, and gland and stuffing box, all combine to quarantee consistent performance of stem seals.
Gasket surfaces between bodies and bonnets are strictly controlled to finishes of 32 to 63 AARH. When combined with engineered bolting design, quality materials and strict assembly procedures, these finishes quarantee consistent sealing in gasket areas.


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GLOBE VALVE

FUNCTION

The globe valve is used where throttling alone or both throttling and shutoff is needed. It may also be used for on-off service, but because of high pressure drop, such application is limited to the cases that the valve is normally closed and the pressure drop is of no importance in valve open condition.
PK cast steel globe valve is regularly made in outside screw and yoke design with full-way type disc.

BODY AND BONNET

The body has a spherical form with large radius, which permits the stress, turbulence and resistance to flow to be kept minimum. The bonnets on valve are equipped with back seat rings.

DISC

The valve is normally supplied with plug type disc.

SEAT RING

The valve is normally supplied with bottom seated type on 8" or larger valve, and the disc has bottom guide type seat rings.

STEM

All stem have the turning and rising cut ACME threads.

YOKE BUSH

The yoke nuts on globe valve are threaded and mounted to the bonnet, where it is secured with tack welding.

PACKING

The packing size is designed to secure maximum tightness along the stem, and the standard packing is a non-asbestos type. We can supply any kinds of packing as required by customer.

GLAND

The gland is made of two pieces. Packing gland is in contact with the packing which is connected to gland flange through a spherical joint. Particular design permits a correct pressure on the packing without any damage to stem due to friction or corrosion.

STUFFING BOX

The stuffing box gives maximum packing stem seal. Lantern ring and grease injector shall be furnished only if specified on the purchase order

HAND WHEELS

Hand wheels are designed for easy operation. They are provided with hammer blow type of 8" and over for Class 150 valve, 6" and over for Class 300 and, 4" and over for Class 600, and 2.5" and over for Class 900 & 1500.
With gearing, motor actuator or cylinder actuator, they are also available for more difficult services.



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SWING CHECK VALVE

FUNCTION

The swing check valve is designed so that it is opened automatically at the forward flow and closed at the reverse flow in horizontal or vertical (upward flow only through valve) piping runs. It has an advantage of low pressure drop and therefore is best suitable for velocity application.

BODY

Body-cover joint of swing check valve is machined as follows:
Class 150 ..................................Male and female.
Class 300 and 600 ................... Male and female.
Class 900 higher class ............. Ring type joint.
We can supply any kinds of gasket as required by customer.



SEAT RING

The seat ring as a welded-in type is designed to prevent any turbulence and damage by corrosion. It is forged or rolled into one piece for all dimensions, heat treated to obtain the desired surface hardness, and cleaned thoroughly before assembling.

SEAT RING

The valve is normally supplied with bottom seated type on 8" or larger valve, and the disc has bottom guide type seat rings.

END CONNECTIONS

In our standard production of valve, the flange ends (RF) and the face to face dimensinos conform to ANSI B16.5 and ASME B16.10, respectively, and they have a raised face serrated finish type or other finish type as requested.
For butt-welded ends (B.W), of which the end to end dimension conforms to ASME B16.10, customer must specify the schedule type required, pipe class, or bore diameter.
Ring joint flanged ends (R.T.J) conform to ASME B16.5 and the end to end dimension follows ASME B16.10. The other special end connections may be supplied as required by customer.

HINGE ARRANGEMENT

? Body penetration is sealed with blind flange and spiral-wound gasket
? Arm pin is located near the disc center of gravity, minimzing sealing surface radius rotation and thus velocity.

ARM ARRANGEMENT

? Hydrofoil profile maintains the disc stability while being lifted by a hydrodynamic force at a flow including pulsating.
? Heavy-balanced weight insures that disc goes to seat immediately upon cessation of flow and minimizes water hammer.


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TITLING DISC CHECK VALVE



FUNCTION

Today, higher velocity and pressure of piping often requires a sophisticated check valve rather than conventional swing type valve. PK tilting disc check valve is designed to handle such higher velocities, prevent damages due to turbulence and avoid “water hammer”phenomenon in piping systems, and it is closed quickly and quietly. The valve is closed quickly because its pivot(hinge pins) is shut by a very small arc.Moreover, line fluid flows both over and under the disc, so that valve closing is cushioned by the line fluid itself. By virtue of quick and quiet closing ability, up to now PK tilting disc check valve has earned good reputation as a “non-slam”check valve.

BODY

Body-cover joint of swing-check valve are machined as follows:
Class 150 ................................................. Male and female.
Class 300 and 600 .................................. Male and female.
Class 900 and 1500 ................................. Ring type joint.
We can supply any kind of gasket per customer requirements.

SEAT RING

Seat rings are welded into valve bodies in order to prevent turbulence and avoid damage due to corrosion seats, forged or rolled in one piece for all dimensions, heat treated to obtain the required surface hardness, and perfectly cleaned before assembly.

END CONNECTIONS

Our standard production covers valve with; FLANGED ENDS(RF) that conform to ASME B16.5 and face to face dimensions that conform to ASME B16.10, with a raised face serrated finish or, on request, with any other finish; BUTT-WELDING ENDS(B.W) with end to end dimensions that conform to ASME B16.10; (Customer must specify the schedule required, or class of pipe, or diameter and bore.) RING JOINT FLANGED ENDS(R.T.J) that conform to ASME B16.5 and with end to end dimensions to ASME B16.10; Other special end connections are supplied to customer requirements.


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DUAL PLATE CHECK VALVE 

TYPICAL CONSTRUCTIONS

Dual plate check valve are supplied retainerless as standard. Our patented design does not have any threaded plugs in the pressure boundary and totally eliminates the potential leakpath to atmosphere. This design meet fugitive emission control.

VALVE FEATURES & ADVANTAGES

- Dual plate Check Valve is economical on installation and maintenance because installation is required less and light weight.
- Dual plate Check Valve is possible to prevent water hammering due to closing valve disk by operating the spring in valve before back flow. Also Due-Check valve prevents large piping the for big gap water levels.
- Dual plate Check Valve can apply variously in piping line because of less than existing Check Valve on restrictions of instaling direction.
- Life spans is longer than existing Check Valve, And preservation and repair are simple.
- It's possible to reduce maintenance fee due to longer durability than existing check valve, easy maintenance.


MATERIAL TEMPERATURE LIMITS

UPPER TEMPERATURE LIMITS



LOWER TEMPERATURE LIMITS

STANDARD DESIGN

WAFER TYPE
Retainerless design supplied as standard

ㆍANSIB16.5
- Flange dims to ANSI B16.5 (MSS-SP44>24")
- Face to face dims to API 594

ㆍAPI 605
- Flange dims to API 605
- Face to face dims to API 594

FLANGED TYPE
- Flange dims to ANSI B16.5 (MSS-SP44>24")
- Face to face dims to API 594

ㆍAPI 6A
- Flange dims to API 6A
- Face to face dims to API 6A

ㆍAPI 6D
- Flange dims to ANSI B16.5
- Face to face dims to API 6D

SOLID LUG TYPE
- Flange dims to ANSI B16.5 (MSS-SP44>24")
- Face to face dims to API 594

ㆍThreaded lug type also available
ㆍJIS 2210 & KS B1511
ㆍEXTENDED BODY
- Flange dims to ANSI B16.5

PRESSURE CLASSES

ㆍASME 150 TO 1500 LB, PN 10 TO 40.
ㆍJIS & KS 5K TO 20K

NOMINAL SIZE RANGE

ASME 150 Ib.2" to 60"
ASME 300 Ib.2" to 40"
ASME 600 Ib.2" to 36"
ASME 900 Ib.2" to 36"
ASME 1500 Ib.2" to 24"
Larger diameter VALVE for the respective pressure classes can be designed and manufactured on request.

RETAINERLESS DESIGN

Dual plate check VALVE are supplied retainerless as standard. Our patented design does not have any threaded plugs in the pressure boundary and totally eliminates the potential leakpath to atmosphere. This design meet fugitive emission control.

SEAT

The seat is designed equal pressure at the plate with the state of stationary hour. The shape of rubber seat could not be changed even in many operation because of having its most hardness satisfaction. The metal to metal seated valve is tested to API 598.

DISC (PLATE)

The two semicircle plate responsiveness of opening and closing is quick and it is strong against corrosion also has a strong durability.

SPRING

The springs have been designed to endure stresses and also ensure operating without failure for much cycles.

RUBBER LINED

Fully Rubber Lined Valve to avoid corrosion Inside are available.