闸阀
　　Gate Valves

　　闸阀起着开启/关闭的作用，主要是通过位于阀门进口和出口之间、阀体中心位置起着流体控制作用的闸板实现的。闸板沿着垂直阀杆轴移动，并与流体流动方向垂直，由此在关闭位置阻塞流体，并随着闸板向全开位置移动而逐步增加流量。美国斯毕尔公司闸阀采用圆柱旋塞结构（旋塞闸阀），或楔形闸板和密封面结构（常规闸阀）。这两种结构都能够在关闭位置与阀体啮合时实现有效的关闭功能，并且都能够配置不上升类型的阀杆（暗杆）。因此闸板的垂直移动不会导致阀杆在阀体上方的延伸。
　　Gate valves perform an on/off function accomplished by means of a flow-controlling gate centered in the valve body between the inlet and outlet sides of the valves. The gate moves along a vertical stem axis, perpendicular to the fluid stream, thereby blocking the flow in the closed position and variably increasing the flow as the gate is moved to the full open position. Spears® gate valves use either a cylindrical plug (Plug Gate Valves) or a wedge-shaped gate and sealing surface design (regular Gate Valves). Both provide positive shut off when engaged with the valve body in the closed position and feature non-rising type stem. This provides vertical movement of the gate without extension of the stem above the valve body.

　　蝶阀
　　Butterfly Valves

　　蝶阀是一种旋转阀，其阀板旋转90度角来实现开启或关闭流体通道的功能。在全闭位置，阀板与弹性材料阀座实现密封。可以通过阀板开启角度的大小来调节流量。美国斯毕尔公司标准蝶阀和Ture Lug（真法兰）蝶阀采用特殊的偏置阀瓣和低接触阀座结构。美国斯毕尔公司的对夹式蝶阀的设计制造融合了特殊低接触结构，阀瓣安装阀座结构和中心阀瓣结构。这些结构在通用橡胶阀座阀门基础上最大限度减小操作力矩，改善密封性能。
　　Butterfly valves are rotary valves in which a disc is rotated 90^o to open or close the flow passage. In the full closed position, the disc seals against an elastomer seat. Flow control can be accomplished by varying the degree to which the disc is opened. Spears® Standard and True Lug type Butterfly Valves utilize a special offset disc and low contact seat designed. Spears® Wafer style Butterfly Valve incorporates a special low contact, disc-mounted seat and centered disc. These designs minimize operation torque and improve sealing capabilities over conventional rubber seated valves.

　　隔膜阀
　　Diaphragm Valves

　　隔膜阀采用一种可活动的弹性材料膜，或称“隔膜”，来限制通过阀门的流道，从而达到对流体进行控制和节流的目的。此外，这种隔膜还将系统流体与阀门内部活动零件隔绝开来。在堰型结构隔膜阀内，水路中心上升区域作为弹性材料隔膜的密封点。当安装在水平位置时，还有利于阀门内流体的排放。从全开位置开始，阀门的操作就是旋转手柄垂直移动压缩物将其挤压向一个螺纹轴上。压缩中所附带的弹性材料隔膜对水路起到限制作用，并最终密封关断流体流动。美国斯毕尔公司隔膜阀在手柄中间配置一个指示器，使得阀门的开启度处于360^o可视状态。在压缩物上还配置特制的止动装置，以防止挤压过紧而造成损害。T型“Zero Dead-Leg”（零死角）隔膜阀是一种特殊结构的阀门，其在阀门的一端配置一个T形管件。这种结构使阀门尽可能接近流体主管道，能够最大限度减少潜在流体淤积形成的“死角”，因此适用于某些特殊的应用场合。
　　Diaphragm valves utilize a moveable elastomeric membrane, or "diaphragm", to constrict the flow passage through the valve, thereby controlling or throttling fluid flow. The diaphragm additionally isolates system fluids from internal moving parts of the valve. In the Weir-Type design, a raised area in the center of the waterway serves as a seal-off point for the elastomeric diaphragm. When installed in a horizontal position, this additionally facilitates drainage of fluid from the valve. From the full-open position, operation of the valve is accomplished by rotating the handle to vertically move a compressor unit on a threaded shaft. This compresses the attached elastomeric diaphragm to constrict the waterway and finally seal-off flow. Spears® diaphragm valves provide an indicator in the center of the handle for 360^o visibility of valve position, and a special stop on the compressor to prevent damage from over-tightening. The T-Style "Zero Dead-Leg" Diaphragm Valve is a special configuration incorporating a Tee fitting at one end of the valve. This design maintains close proximity of the valve to the fluid mainline to minimize "dead leg" of potential fluid accumulation, where required by specific application.

　　截止阀和Y形阀门
　　Globe Valves & Y-Pattern Valves

　　截止阀的特点在于阀体由部分分开的两部分组成，中心流道的开启和关闭是通过安装在阀体上某个适当角度的螺杆上升或下降来实现。截止阀的英文名称Globe Valve中的“Globe”（球体）来源于早先截止阀的球形阀体结构而得名。截止阀具有极好的流量调节性能，但是由于拐弯的流道而对流体具有很高的阻力。Y形阀（也称为“斜形阀”）是截止阀与角型阀杆的结合体。这种结构对流道的阻力较小，从而在保持截止阀具有相同的节流性能的基础上改善了截止阀的介质流动性。
　　Globe valves are characterized by a partition separating the two halves of the body with a center passage that is opened and closed by a screw-down/screw-up seat mounted at right angle to the body. The "Globe" name was derived from the original spherical body design for these valves. Globe valves offer excellent flow regulating characteristics, but have a high resistance due to the turning flow path. The Y-Pattern Valve (aka, "oblique valves") is a hybrid globe valve incorporating an angled stem. This less restrictive flow path design improves flow while maintaining the same excellent throttling characteristics as a globe valve.

　　针形阀
　　Needle Valves

　　针形阀是配置锥形插式接头的小型截止阀。其锥形插头或“针头”是阀体上配置的螺纹旋进旋出的节流道，因此能够有效控制节流面积。针形阀特别适用于计量测量和其他精确调节流量控制的应用场合。美国斯毕尔公司的针形阀采用PTFE阀杆密封，不采用弹性材料，因此最适用于耐化学腐蚀的应用场合。这些针形阀采用传统截止阀结构和便于使用的多用途直角结构。
　　Needle valves are small sizes of globe valves fitted with a tapered plug. The tapered plug or "needle" is screwed in or out of a mating orifice in the body and thus controls the effective orifice size. Needle valves are excellent for metering and other fine adjustment flow control applications. Spears® Needle Valves use PTFE stem seals and no elastomers for optimum chemical resistance. These are produced in both a conventional "globe" pattern and convenient right-angle pattern design for application versatility.