Special Valve

Petrosadid: Special Valve

We supply a wide range of Special Valves, our production range covers all major national and international dimensional standards. Through our exceptional relationships with Valve manufacturers from Europe and Far East, we supply special Manual Valves to the most demanding industries. Our products includes below types of special manual valves, all in standard and specialty applications.

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Rising Stem Ball Valves

A rising stem ball valve incorporates tilt-and-turn operation, eliminating seal rubbing which is one of the primary causes of valve failure. When the valve is closed, the core is wedged against the seat, ensuring positive shutoff. When the valve is open, the core tilts away from the seal and the flow passes uniformly around the core face. The Cameron ORBIT rising stem ball valve utilizes this operating principle, delivering fast, low-torque operation and long term reliable performance. Additionally, the valve is able to eliminate localized high- velocity flow that typically creates uneven seat wear exhibited by ordinary ball, gate, and plug valves. Additionally, there are three basic types of bores for ball valves: full port, reduced port (also known as standard port), and v-port. These four types have different constructions and purposes.

Dual Expanding Plug (DBB)

Dual Expanding Plug Valve provides two seating surfaces, each of which, seal to both directions. When the valve is in closed position, each individual seal is fully isolating not allowing any leakage, either from downstream or upstream or from the body cavity. In case of body cavity overpressure, venting/bleeding is provided by a thermal relief. Therefore, the downstream pipeline is fully isolated from upstream pressure without the need for pressure balancing.

Lubricated Plug Valves

The Lubricated Plug Valve delivers the high level of performance you have come to expect with Homestead. Principle applications include natural gas, propane gas, digester gas, liquid asphalt, HVAC balancing, ore slurries, and various other industrial services.

Homestead Lubricated Plug Valves deliver cost effective quick opening and closing with a tight, leak-proof closure. They are available in standard rectangular port, full rectangular port, full round port, diamond port and multi-port designs. Available end connections are threaded (1/2”-4”) and flanged (1”-24”). All Series 600 valves have earned CRN Registration. Select models and sizes carry CSA Approval and UL Listing. Consult factory for applicable models and sizes.


CONSTRUCTION: Standard material is high tensile ASTM A126 Class B cast iron. ASTM A536 65-45-12 ductile iron is also available for high temperature applications. Flange thickness, diameter and drilling fully conform to ANSI B16.1 Class 125.


Plug valves are usually lower in cost and lighter in weight than comparable gate or globe valves.


Only a small initial injection of sealant, with minimal follow-up sealing, is required for positive shut-off. Minimal quick and easy follow-up sealing assures long lasting service.


The single solid-piece plug design features true bi-directional seating and low vibration operation.


Various port configurations make them suitable for a wide range of applications.

SEAL: A thin film of sealant not only forms an incompressible seal to prevent gas or liquid leakage, but also reduces friction between the body and plug, offering low torque operation.


Metal to metal seating assures long life, with no rubber to wear.

Wafer Duo-check Valves

The Dual Plate Check Valve is an all purpose non return valve that is much stronger, lighter in weight and smaller in size compared to a conventional swing check valve or lift check valve. SVC Dual Plate Check Valve is the most versatile design available in specific materials of construction to suit particular pressure, temperature and fluid flow characteristics. Some of the typical applications are as below. SVC Dual Plate Check Valve is the most versatile design available in specific materials of construction to suit particular pressure, temperature and fluid flow characteristics. Some of the typical applications are as below. Water Supply Systems, Fire Water Systems, Cooling Water, Chilled /Hot Water Systems, Boiler Feed Water, Sea Water, Potable Water, Raw Water etc

Post Indicator Gate Valves

A post indicator valve (PIV) is a valve assembly used to open or close the water supply to fire protection systems in large buildings. It consists of a conventional gate or butterfly valve located on the fire system water main with a raised post that protrudes above ground level or from a wall. The valve actuator and a visual indicator of the valve status are housed at the top of the post. This arrangement allows the valve to be opened and closed easily and for its position to be clearly seen. The three main types — ground, pedestal, and wall — are installed in different configurations and orientations.

PIV is an indicate type control valve which install to water supply line, easy to confirm opening / closing conditions through indicating window. Gate valve is NRS type for designed with minimized weight and easy to installation.

Plug Valve

A Plug Valve is a quarter-turn rotational motion Valve that use a tapered or cylindrical plug to stop or start flow. In the open position, the plug-passage is in one line with the inlet and outlet ports of the Valve body. If the plug 90° is rotated from the open position, the solid part of the plug blocks the port and stops flow. Plug valves are similar to Ball valves in operation.

Plug valve Disk

Rectangular port plugs are the most common port shape. The rectangular port represents 70 to 100 percent of the internal pipe area. Round port plugs have a round opening through the plug. If the port opening is the same size or larger than the inside diameter of the pipe, a full port is meant. If the opening is smaller than the inside diameter of the pipe, a standard round port is meant. Diamond port plug has a diamond-shaped port through the plug and they are venturi restricted flow types. This design is suitable for throttling service.

Typical applications of Plug valves

A Plug Valve can be used in many different fluid services and they perform well in slurry applications. The following are some typical applications of Plug valves:

• Air, gaseous, and vapor services

• Natural gas piping systems

• Oil piping systems

• Vacuum to high-pressure applications

Advantages and disadvantages of Plug valves


• Quick quarter turn on-off operation

• Minimal resistance to flow

• Smaller in size than most other valves


• Requires a large force to actuate, due to high friction.

• NPS 4 and larger valves requires the use of an actuator.

• Reduced port, due to tapered plug.

Diaphragm Valve

Diaphragm valves (or membrane valves) consists of a valve body with two or more ports, a diaphragm, and a "weir or saddle" or seat upon which the diaphragm closes the valve. The valve body may be constructed from plastic, metal, wood or other materials depending on the intended use. Originally, the diaphragm valve was developed for use in industrial applications and/or pipe-organs. Later on the design was adapted for use in the bio-pharmaceutical industry by using compliant materials that can withstand sanitizing and sterilizing methods.

There are two main categories of diaphragm valves: one type seals over a "weir" (saddle) and the other (sometimes called a "full bore or straight-way" valve) seals over a seat. The weir or saddle type is the most common in process applications and the seat-type is more commonly used in slurry applications to reduce blocking issues but exists also as a process valve. While diaphragm valves usually come in two-port forms (2/2-way diaphragm valve), they can also come with three ports (3/2-way diaphragm valves also called T-valves) and more (so called block-valves). When more than three ports are included, they generally require more than one diaphragm seat; however, special dual actuators can handle more ports with one membrane.

Diaphragm valves can be manual or automated. Their application is generally as shut-off valves in process systems within the industrial, food and beverage, pharmaceutical and biotech industries. The older generation of these valves is not suited for regulating and controlling process flows, however newer developments in this area have successfully tackled this problem. In addition to the well-known, two way shut off diaphragm valve, other types include: Three way zero dead leg valve, sterile access port, block and bleed, Val bow and tank bottom valve.

Choke Valve

Choke Valve is a type of control valves, mostly used in oil and gas production wells to control the flow of well fluids being produced. Another purpose that the choke valves serve is to kill the pressure from reservoir and to regulate the downstream pressure in the flow lines. Choke valves allow fluid flow through a very small opening, designed to kill the reservoir pressure while regulating the well production. The reservoir fluids can contain sand particles. Hence the choke valves are usually designed to handle an erosive service.

in heavy industrial or fluid engineering contexts, a choke valve is a particular design of valve that raises and lowers a solid cylinder (called a "plug" or "stem") which is placed around or inside another cylinder that has holes or slots. The design of a choke valve means fluids flowing through the cage are coming from all sides and that the streams of flow (through the holes or slots) collide with each other at the center of the cage cylinder, thereby dissipating the energy of the fluid through "flow impingement". The main advantage of choke valves is that they can be designed to be totally linear in their flow rate.

Double Block and Bleed Ball valve

the purpose of the block and bleed manifold is to isolate or block the flow of fluid in the system, so the fluid from upstream of the manifold does not reach other components of the system that are downstream, then bleed off or vent the remaining fluid from the system on the downstream side of the manifold.

For example, a block and bleed manifold would be used to stop the flow of fluids to some component, then vent the fluid from that component’s side of the manifold, in order to effect some kind of work (maintenance/repair/replacement) on that component.

Double block and bleed valves are most commonly used in the oil and gas industry, but can also be helpful in many other industries. It's typically used where bleeding the valve cavity is required, where piping needs isolation for maintenance, or for any of these other scenarios:

• Prevent product contamination

• Remove equipment from service for cleaning or repair

• Meter calibration

• Liquid service near waterways or municipalities

• Transmission and storage

• Chemical injection and sampling

• Isolate instrumentation such as pressure indicators and lever gauges

• Primary process steam


Highlights of the Valves


Forged carbon Steel valves: ASTM A105/ A105M

Forged carbon Steel valves For low Temprature Service: ASTM A350/ A350M (LF1, LF2, LF3, LF5, LF6, LF9, LF 787)

Forged Alloy Steel and Stainless Steel valves For High Temprature Service: ASTM A182/ A182 M-98ª(F 304, F 304H, F 304L, F 304N, F304 LN, F 309H, F310, F 310H, F 310 MoLN, F 316, F 316H, F 316L, F 316N, F 316LN, F 317, F 317L, F 347, F 347 H, F 348, F 348 H, F 321, F321 H)

Forged Duplex Steel valve : ASTM A182 (F 50, F 51, F 52, F 53M F 54, F 55, F 57, F 59, F 60, F 61, F 904L)

ASTM A352/ A352M (LCA, LCB, LCC, LC1, LC2, LC2-1, LC3,LC4, LC9(J31300), CA6NM)

ASTM A351/ A351 M (CF8(F304), CF3(F304L), CF3M(F316L), CF8M(F316))

ASTM A217/ A217 M-98a( WC1, WC4, WC5, WC6, WC9, WC11, C5, C12, C12A,

ASTM A351/ A351 M (CN7M, CD4MCu, CG8M, CK3MCuN)

SA-494/ SA-494 M(UNS N02100, UNS N24135, UNS N04020, UNS N24030, UNS N24025, UNS N24130, UNS N30012, UNS N30007, UNS N30003, UNS N06040, UNS N30002, UNS N30107, UNS N26455, UNS N26625, UNS N26055, UNS N30003, UNS N26022, UNS N08826, UNS N26059)


API 6D, API 600, API 599, API 598, API 608, API 602, ASME B16.10, ASME B16.5, ASME B16.47 (Serie A and Serie B) and MSS SP44 are the key specifications covering the dimensions and the manufacturing tolerances of valves.

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