{"id":666,"date":"2026-08-29T14:10:50","date_gmt":"2026-08-29T06:10:50","guid":{"rendered":"http:\/\/www.bosder.com\/?post_type=product&p=666"},"modified":"2026-09-17T11:33:19","modified_gmt":"2026-09-17T03:33:19","slug":"bsd-hp-thin-film-regulating-valve","status":"publish","type":"product","link":"https:\/\/www.bosder.com\/en\/product\/bsd-hp-thin-film-regulating-valve\/","title":{"rendered":"BSD-HP Diaphragm Control Valve"},"content":{"rendered":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Overview<\/td>\n<\/tr>\n
The BSD Series of compact pneumatic control valves are small, lightweight, accurate, and fast. Developed by integrating proven design technologies from both domestic and international sources, extensive manufacturing experience, and advanced structural designs from around the world, they represent a new generation of control valves that meet IEC standards and represent state-of-the-art technology.<\/td>\n<\/tr>\n
Compact pneumatic control valves are among the most widely used and important products in process control system actuators. Within this product series, the BSDHP pneumatic compact single-seat control valve, the BSDHM pneumatic compact sleeve-type control valve, and the BSDHN pneumatic compact double-seat control valve are among the most widely available and versatile general-purpose products available to users. They are suitable for process control systems involving general fluid media and standard process conditions.<\/td>\n<\/tr>\n
In addition to the common advantages of pneumatic instruments, the BSD Series of compact pneumatic control valves feature reliable operating characteristics, accurate flow characteristics, a wide adjustable range, stable operation, and extremely low leakage rates\u2014all of which are the standout features of this product series. Therefore, these advantages will ensure high-quality control performance across a wide range of applications in various industries.<\/td>\n<\/tr>\n
Principle of Operation and Structure<\/td>\n<\/tr>\n
The BSDHP-type pneumatic compact single-seat control valve consists of a ZHA(B)-type pneumatic multi-spring diaphragm actuator and a VJP-type low-flow-resistance straight-through single-seat valve. See Figure 1(a).<\/td>\n<\/tr>\n
The BSDHM-type pneumatic compact sleeve control valve consists of a ZHA(B)-type pneumatic multi-spring diaphragm actuator and a VJM-type low-flow-resistance sleeve valve. See Figure 1(b).<\/td>\n<\/tr>\n
The BSDHN-type pneumatic compact double-seat control valve consists of a ZHA(B)-type pneumatic multi-spring diaphragm actuator and a VIN-type double-seat valve. See Figure 1(c).<\/td>\n<\/tr>\n
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When an external pneumatic signal is applied to the diaphragm chamber, the pressure acts on the diaphragm to generate thrust, compressing the spring assembly. This causes the push rod to move, which in turn drives the valve stem to open or close the valve plug until the thrust balances the reaction force from the compressed spring assembly, causing the valve to stabilize at a certain stroke. Based on this principle, the stroke of the valve plug is directly proportional to the magnitude of the input signal.<\/td>\n<\/tr>\n
Pneumatic multi-spring diaphragm actuators can be classified into two types based on their operating principle: direct-acting and reverse-acting. A direct-acting actuator, designated as the ZHA type, is one in which the push rod moves toward the diaphragm chamber when the signal pressure increases. An actuator in which the push rod moves toward the diaphragm chamber as the signal pressure increases is a reverse-acting actuator, designated as the ZHB type. They are illustrated in Figures 1(a) and 1(b), respectively.<\/td>\n<\/tr>\n
Compact pneumatic control valves can be classified into two types based on their operating mode: air-to-close and air-to-open. An air-to-close valve consists of a direct-acting actuator and a valve; when the input signal pressure changes from the lower limit to the upper limit, the valve moves from fully open to fully closed. Air-to-close valves consist of a reverse-acting actuator and a valve; when the input signal pressure changes from the lower limit to the upper limit, the valve moves from fully closed to fully open. These are shown in Figures 1(a), 1(b), and 1(c), respectively.<\/td>\n<\/tr>\n
Pneumatic multi-spring diaphragm actuators are compact, lightweight, and easy to install and calibrate. It consists of major components such as the diaphragm, compression springs, tray, push rod, bracket, bushing, and diaphragm cover. The diaphragm has a deep bowl shape with minimal variation in effective area and is made of high-quality rubber, ensuring normal operation at temperatures ranging from -40\u00b0C to +85\u00b0C. The compression springs are arranged in a multi-spring configuration to reduce overall height. The guide surfaces of the push rod are precision-machined to increase hardness and reduce surface roughness, thereby minimizing hysteresis and improving sealing performance. The reaction-type actuator employs an O-ring seal that interfaces with the push rod and bushing. This design is structurally simple and provides reliable sealing. Through proper design and precise machining, this actuator eliminates the need for a compression spring adjustment mechanism, allowing for one-time assembly and reducing the hassle of adjustment. See Figure 2.<\/td>\n<\/tr>\n
<\/td>\n<\/tr>\n
Low-flow-resistance straight-through single-seat valves, cartridge valves, and double-seat valves feature a simple and compact design and offer a relatively high flow coefficient. Single-seat valves and cartridge valves adopt a straight-through, single-seat, top-guided design without a bottom cover; they are small in size, lightweight, and feature a smooth flow path, resulting in high efficiency. The valve body connects to piping via flat, raised-face, and recessed-face flanges to accommodate different nominal pressures. Valve bonnets are available in standard and medium-temperature types for use at different operating temperatures. The single-seat valve features an upper-guided piston-type plug. The sleeve valve plug is cylindrical and guided by the inner circumference of the sleeve, which is precision-machined to feature window openings with specific characteristics. The double-seat valve plug is of the top- and bottom-guided piston type. All valve plugs feature precise flow characteristics and meet the slope deviation requirements specified by IEC and national standards. The standard packing material is molded polytetrafluoroethylene (PTFE); special packings, such as flexible graphite, may also be selected based on on-site application requirements.<\/td>\n<\/tr>\n
A single-seat valve mainly consists of components such as the valve body, valve bonnet, valve plug, valve seat, valve stem, packing, and packing gland; a sleeve valve mainly consists of components such as the valve body, valve bonnet, sleeve, valve plug, valve stem, packing, and packing gland; A double-seat valve primarily consists of a valve body, valve bonnet, valve plug, valve seat, valve stem, packing, packing gland, and sleeve. The upper valve bonnet features a packing chamber containing PTFE packing (or high-temperature packing), as shown in Figure 3.<\/td>\n<\/tr>\n
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The valve body, valve seat, sleeve, valve plug, and valve stem are all made of 1Cr18Ni9Ti stainless steel. To extend service life, depending on user requirements, the sealing surfaces between the valve plug and seat, and between the sleeve and valve plug, can be overlaid with Co, Cr, or W hard alloys. If PTFE or rubber seals are used, excellent sealing performance can be achieved. To meet various corrosion resistance requirements, the valve can also be manufactured from Hastelloy B, Hastelloy C, Monel, 316L stainless steel, titanium, and other materials.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>","protected":false},"excerpt":{"rendered":"

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BSD-HP Diaphragm Control Valve<\/span> Read More \u00bb<\/a><\/p>","protected":false},"featured_media":942,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"product_brand":[],"product_cat":[24],"product_tag":[],"class_list":["post-666","product","type-product","status-publish","has-post-thumbnail","product_cat-self-controlled-ball-valve","desktop-align-left","tablet-align-left","mobile-align-left","ast-product-gallery-layout-vertical-slider","ast-product-tabs-layout-horizontal","first","instock","featured","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/product\/666","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/media\/942"}],"wp:attachment":[{"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/media?parent=666"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/product_brand?post=666"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/product_cat?post=666"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.bosder.com\/en\/wp-json\/wp\/v2\/product_tag?post=666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}